Optimization method and device for setting of base entrance and exit, and medium

Abstract

The invention discloses a base gateway setting optimization method and device and a medium. Static and dynamic traffic data of a base are obtained, driver visual characteristic factors and a preset formula are combined, and the minimum value of the included angle between the entrance and the road is calculated and compared with the initial value of the included angle. If the initial value is greater than or equal to the minimum value and the traffic capacity meets the traffic demand, confirming that the entrance and exit setting scheme is feasible; and if the conditions are not met, optimizing the speed limiting scheme, and re-evaluating the optimized scheme. And if the optimized scheme does not meet the condition, judging that the base does not have the opening condition. According to the process, through scientific quantitative evaluation and optimization, the rationality and safety of entrance and exit setting are ensured, and the scientificity and adaptability of traffic design are improved. According to the invention, the problem that the traffic entrance and exit intersection of the base cannot be accurately set in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the field of optimizing the settings of base entrances and exits, and particularly to an optimization method, device and medium for setting base entrances and exits. Background Art

[0002] With the rapid development of urban transportation, the design and optimization of traffic entrances and exits have become key factors in ensuring traffic safety and efficiency. Traditional traffic entrance and exit designs mainly rely on the experience and intuition of designers, lacking scientific quantitative evaluation methods. The deficiencies of this method are as follows: Experience dependence: In the prior art, the design of the angle between the entrance / exit and the road often depends on the personal experience and judgment of designers, resulting in inconsistencies and unreliabilities in design results.

[0003] Lack of scientific quantitative management: In traffic design, traffic impact assessment and safety assessment work, there is a lack of scientific quantitative management of the angle between the entrance / exit and the road, making the design and review management process lack unified standards and scientific basis.

[0004] Safety hazards and efficiency problems: Due to unreasonable design, it may lead to traffic safety accidents or traffic congestion problems, affecting the overall efficiency of urban traffic.

[0005] Lack of unity in improvement measures: When the opening design of the entrance / exit is unreasonable, there is a lack of scientific and unified methods to formulate improvement measures, resulting in great differences in the rationality and application feasibility of improvement plans.

[0006] These impacts result in the inability of the prior art to accurately set the traffic entrance and exit intersections of the base. Summary of the Invention

[0007] The present invention provides an optimization method, device and medium for setting base entrances and exits to solve the problem in the prior art that the traffic entrance and exit intersections of the base cannot be accurately set.

[0008] In a first aspect, the present application provides an optimization method for setting base entrances and exits, including: Obtaining the static traffic data of the base and the dynamic traffic data of the base according to a preset base entrance and exit setting scheme; Calculating the minimum included angle value of the angle between the entrance / exit and the road according to the preset driver visual characteristic factors, the static traffic data of the base, the dynamic traffic data of the base and a preset first formula; Comparing the minimum included angle value with the initial value of the angle between the entrance / exit and the road of the preset base. If the initial value is greater than or equal to the minimum included angle value, calculating the calculation result of the traffic capacity of the base according to a preset second formula group; Set the traffic capacity threshold for the entrance / exit and the connecting road according to the calculated traffic capacity result; Compare the traffic capacity threshold with the preset traffic demand. If the traffic demand is less than or equal to the traffic capacity threshold, confirm that the preset base entrance / exit setting plan is feasible and output the base entrance / exit setting plan; If the initial value is less than the minimum included angle value or the traffic demand is greater than the traffic capacity threshold, optimize the preset speed limit plan for the base entrance / exit and the connecting road according to the preset optimization conditions to obtain an optimized base entrance / exit setting plan; Obtain the static traffic data of the optimized base entrance / exit setting plan and the dynamic traffic data of the base according to the preset optimization conditions; According to the static traffic data of the optimized base entrance / exit setting plan, the dynamic traffic data of the base, the preset first formula and the preset second formula group, calculate the minimum included angle and the traffic capacity value between the base entrance / exit and the road, and evaluate the feasibility of the optimized base entrance / exit setting plan; If the optimized base entrance / exit setting plan does not meet the preset optimization conditions, determine that the base does not have the opening condition.

[0009] This application calculates the minimum value of the included angle between the entrance / exit and the road and the traffic capacity by obtaining the static and dynamic traffic data of the base, combining the driver's visual characteristic factors and the preset formulas. If the initial included angle value is greater than or equal to the minimum value and the traffic capacity meets the traffic demand, confirm that the preset entrance / exit setting plan is feasible; otherwise, optimize the speed limit plan and re-evaluate the optimized plan. If the optimized plan still does not meet the conditions, determine that the base does not have the opening condition. This process ensures the rationality and safety of the entrance / exit setting through scientific quantitative evaluation and optimization, improves the scientificity and adaptability of traffic design, and this application solves the problem in the prior art that the traffic entrance / exit of the base cannot be accurately set.

[0010] As a preferred embodiment of the first aspect, the optimization of the preset speed limit plan for the base entrance / exit and the connecting road to obtain an optimized base entrance / exit setting plan is specifically as follows: The parameters for optimizing the preset speed limit plan for the base entrance / exit and the connecting road include the preset speed limit value for the base entrance / exit and the speed limit value for the connecting road; Judge whether the speed limit value of the base entrance / exit is greater than the preset first threshold; If the speed limit value of the base entrance / exit is greater than the preset first threshold, lower the speed limit value of the base entrance / exit by a preset gear value, keep the speed limit value of the connecting road unchanged, confirm that the optimization is completed, and obtain the optimized speed limit plan; If the speed limit value at the base entrance and exit is less than or equal to a preset first threshold, determine whether the speed limit value of the connecting road is greater than a preset second threshold; If the speed limit value of the connecting road is less than or equal to the second threshold, confirm that the base does not have the opening condition; If the speed limit value of the connecting road is greater than the second threshold, lower the speed limit value of the connecting road by a preset gear value, keep the speed limit value at the base entrance and exit unchanged, and add one to the preset number of times of lowering the speed limit of the connecting road; If the preset number of times of lowering the speed limit of the connecting road is less than or equal to two, confirm that the optimization is completed and obtain the optimized speed limit plan; if the preset number of times of lowering the speed limit of the connecting road is greater than two, confirm that the base does not have the opening condition.

[0011] In this preferred embodiment, the present application optimizes the speed limit plans of the base entrance and exit and the connecting road to ensure the rationality and safety of the entrance and exit settings. First, determine whether the speed limit value at the entrance and exit is greater than a preset first threshold. If it is greater, lower the speed limit value at the entrance and exit by a preset gear value, while keeping the speed limit value of the connecting road unchanged, so as to complete the optimization and obtain the optimized speed limit plan. If the speed limit value at the entrance and exit is less than or equal to the first threshold, further determine whether the speed limit value of the connecting road is greater than a preset second threshold. If the speed limit value of the connecting road is less than or equal to the second threshold, confirm that the entrance and exit do not have the opening condition; if it is greater than the second threshold, lower the speed limit value of the connecting road by a preset gear value and increase the number of times of lowering the speed limit by one. If the number of times of lowering the speed limit is less than or equal to two, confirm that the optimization is completed; if it is greater than two, confirm that the entrance and exit do not have the opening condition. This optimization process ensures that while meeting traffic demands, the entrance and exit design takes into account traffic capacity and traffic safety, and improves the scientificity and adaptability of traffic planning by gradually adjusting the speed limit value.

[0012] As a preferred embodiment of the first aspect, the obtaining of the static traffic data of the base and the dynamic traffic data of the base is specifically as follows: The static traffic data of the base includes the number of lanes in the exit direction of the entrance and exit, the width of a single lane in the exit direction of the entrance and exit, the number of lanes in the oncoming direction from the left of the connecting road, the width of the outermost lane in the oncoming direction from the left of the connecting road, the total width of the exit lane and the median strip in the oncoming direction from the right of the connecting road, the width of the innermost lane at the entrance of the oncoming direction from the right of the connecting road, and the initial value of the included angle between the entrance and exit and the road design; The dynamic traffic data of the base includes the traffic flow at the base entrance and exit, the speed limit value, and the traffic flow and speed value of the connecting road of the base.

[0013] In this preferred embodiment, the present application provides a comprehensive and accurate basis for the optimization of the entrance and exit settings by obtaining the static traffic data and dynamic traffic data of the base. The static traffic data covers key parameters such as the number of lanes, lane width, median width, and initial included angle design value of the entrance and exit and the connecting roads, which lay the foundation for evaluating the rationality of the geometric design of the entrance and exit. The dynamic traffic data includes the traffic flow out of the entrance and exit, speed limit value, and traffic flow and vehicle speed values of the connecting roads, which reflect the actual traffic operation conditions and provide real-time basis for the evaluation of traffic capacity and speed limit optimization. By combining the static and dynamic data, the present application can scientifically evaluate the rationality of the included angle between the entrance and exit and the road, and optimize the speed limit plan accordingly, so as to improve the traffic flow passing efficiency on the premise of ensuring traffic safety. This process not only improves the scientificity and adaptability of the entrance and exit design, but also enhances the flexibility and safety of traffic planning through quantitative evaluation and optimization.

[0014] As a preferred embodiment of the first aspect, calculating the minimum included angle value of the initial entrance and exit and the road according to the preset driver visual characteristic factors, the static traffic data of the base, the dynamic traffic data of the base, and a preset first formula specifically includes: The preset first formula is: ; In the formula, and are respectively the driver's visual field angles of the vehicles that need to turn right and left when driving out of the entrance and exit of the base; S ar and S al are respectively the stopping sight distances of the vehicles that need to turn right and left when driving out of the entrance and exit of the base; S br and S bl are respectively the stopping sight distances of the vehicles coming from the left and right of the connecting road of the base; is the initial value of the included angle between the entrance and exit of the preset base and the road; is the minimum value of the included angle between the initial entrance and exit and the road; Calculate the minimum included angle value of the initial entrance and exit and the road according to the preset first formula.

[0015] In this preferred embodiment, the present application accurately calculates the minimum value of the included angle between the initial entrance and exit and the road by comprehensively considering the driver visual characteristic factors, the static and dynamic traffic data of the base, and applying the preset first formula. This formula covers key parameters such as the driver's visual field angle and stopping sight distance, ensuring the scientificity and practicality of the calculation results.

[0016] As a preferred embodiment of the first aspect, calculating the traffic capacity measurement result of the base according to the preset second formula group specifically includes: Calculating the traffic capacity values of the connecting road at the base entrance and exit and the base entrance and exit according to the preset second formula group; Among them, the traffic capacity of the connecting road at the base entrance and exit is the maximum traffic capacity value based on the stopping sight distance of the vehicles on the connecting road; The traffic capacity value of the base entrance and exit is the minimum value of the maximum traffic capacity based on the minimum stopping sight distance of the vehicles exiting the entrance and exit and the maximum traffic capacity value based on the available headway of the connecting road.

[0017] The preset second formula group is specifically: ; In the formula, S i is the safe stopping sight distance of the vehicles at the entrance and exit and the connecting road of the base; V i is the driving speed of the vehicles at the entrance and exit and the connecting road of the base; t is the driver's braking reaction time; is the friction coefficient between the road surface and the tire of the connecting road at the base entrance and exit; h i is the longitudinal slope of the connecting road at the base entrance and exit; k is the braking coefficient; is the minimum safe distance between the vehicle and the obstacle after it comes to a complete stop; i is the traffic flow number; ; In the formula, is the maximum traffic capacity value at the safe stopping sight distance of the base; is the safe stopping sight distance of the vehicles on the connecting road at the base entrance and exit; is the driving speed of the vehicles on the connecting road at the base entrance and exit; is the maximum traffic capacity value of the base entrance and exit; is the safe stopping sight distance of the base entrance and exit; is the driving speed of the vehicles at the base entrance and exit; is the critical insertion gap for the external road traffic flow to insert, is the headway when the traffic flow at the entrance and exit enters the external road.

[0018] In this preferred embodiment, by applying the preset second formula group, the present application can calculate the maximum traffic capacity value of the base under the minimum stopping sight distance, as well as the minimum value of the traffic capacity of the entrance and exit based on the stopping sight distance. This calculation process takes into account the impact of the stopping sight distance on the traffic capacity, thus providing a scientific basis for evaluating whether the base meets the opening conditions of the entrance and exit. Specifically, the maximum traffic capacity value under the minimum stopping sight distance ensures that vehicles can still pass through the entrance and exit safely and efficiently under the most adverse conditions; while the minimum value of the traffic capacity of the entrance and exit based on the stopping sight distance guarantees that the entrance and exit design has sufficient traffic capacity while meeting the safety requirements.

[0019] In a second aspect, the present application provides an optimization device for the base entrance and exit setting. The optimization device for the base entrance and exit setting includes an acquisition module, an evaluation module, and an optimization module: The acquisition module is used to obtain the static traffic data of the base and the dynamic traffic data of the base according to the preset base entrance and exit setting scheme; The evaluation module is used to calculate the minimum included angle value between the entrance and exit and the road according to the preset driver visual characteristic factors, the static traffic data of the base, the dynamic traffic data of the base, and the preset first formula; Compare the minimum included angle value with the initial value of the included angle between the entrance and exit and the road of the preset base. If the initial value is greater than or equal to the minimum included angle value, calculate the traffic capacity measurement result of the base according to the preset second formula group; Set the traffic capacity threshold of the entrance and exit and the connecting road according to the traffic capacity measurement result; Compare the traffic capacity threshold with the preset traffic demand. If the traffic demand is less than or equal to the traffic capacity threshold, the preset base entrance and exit setting scheme is feasible; output the base entrance and exit setting scheme; If the initial value is less than the minimum included angle value or the traffic demand is greater than the traffic capacity threshold, optimize the preset speed limit scheme of the base entrance and exit and the connecting road according to the preset optimization conditions to obtain the optimized base entrance and exit setting scheme; The optimization module is used to obtain the static traffic data of the optimized base entrance and exit setting scheme and the dynamic traffic data of the base according to the preset optimization conditions; According to the static traffic data of the optimized base entrance and exit setting scheme, the dynamic traffic data of the base, the preset first formula, and the preset second formula group, measure the minimum included angle and the traffic capacity value between the base entrance and exit and the road, and evaluate the feasibility of the optimized base entrance and exit setting scheme; If the optimized base entrance and exit setting scheme does not meet the preset optimization conditions, it is determined that the base does not have the opening conditions.

[0020] This device uses three modules to divide the work and coordinate with each other, and can accurately provide a setting plan for traffic entrances and exits. This application calculates the minimum value of the angle between the entrance / exit and the road and the traffic capacity by obtaining the static and dynamic traffic data of the base, combining the driver's visual characteristic factors and a preset formula. If the initial value of the angle is greater than or equal to the minimum value and the traffic capacity meets the traffic demand, it is confirmed that the preset entrance / exit setting plan is feasible; otherwise, the speed limit plan is optimized, and the optimized plan is re-evaluated. If the optimized plan still does not meet the conditions, it is determined that the base does not have the condition for opening. Through scientific quantitative evaluation and optimization, this process ensures the rationality and safety of the entrance / exit setting, improves the scientificity and adaptability of traffic design, and this application solves the problem in the prior art that the traffic entrance / exit of the base cannot be accurately set.

[0021] As a preferred embodiment of the second aspect, the optimization of the preset speed limit plan for the base entrance / exit and the connecting road to obtain an optimized base entrance / exit setting plan is specifically as follows: The parameters for optimizing the preset speed limit plan for the base entrance / exit and the connecting road include the preset speed limit value of the base entrance / exit and the speed limit value of the connecting road; Judge whether the speed limit value of the base entrance / exit is greater than a preset first threshold; If the speed limit value of the base entrance / exit is greater than the preset first threshold, lower the speed limit value of the base entrance / exit by a preset gear value, keep the speed limit value of the connecting road unchanged, confirm that the optimization is completed, and obtain an optimized speed limit plan; If the speed limit value of the base entrance / exit is less than or equal to the preset first threshold, judge whether the speed limit value of the connecting road is greater than a preset second threshold; If the speed limit value of the connecting road is less than or equal to the second threshold, confirm that the base does not have the condition for opening; If the speed limit value of the connecting road is greater than the second threshold, lower the speed limit value of the connecting road by a preset gear value, keep the speed limit value of the base entrance / exit unchanged, and increase the preset number of downshift times of the connecting road speed limit by one; If the preset number of downshift times of the connecting road speed limit is less than or equal to two, confirm that the optimization is completed and obtain an optimized speed limit plan; if the preset number of downshift times of the connecting road speed limit is greater than two, confirm that the base does not have the condition for opening.

[0022] In this preferred embodiment, the present application optimizes the speed limit scheme of the base entrances and exits and the connecting roads to ensure the rationality and safety of the entrance and exit settings. First, it is determined whether the speed limit value at the entrance and exit is greater than a preset first threshold. If it is greater, the speed limit value at the entrance and exit is lowered by a preset step value, while the speed limit value of the connecting road remains unchanged, thereby completing the optimization and obtaining the optimized speed limit scheme. If the speed limit value at the entrance and exit is less than or equal to the first threshold, it is further determined whether the speed limit value of the connecting road is greater than a preset second threshold. If the speed limit value of the connecting road is less than or equal to the second threshold, it is confirmed that the entrance and exit do not have the opening condition; if it is greater than the second threshold, the speed limit value of the connecting road is lowered by a preset step value, and at the same time, the number of times of speed limit reduction is incremented by one. If the number of times of speed limit reduction is less than or equal to two, it is confirmed that the optimization is completed; if it is greater than two, it is confirmed that the entrance and exit do not have the opening condition. This optimization process ensures that while meeting traffic demands, the entrance and exit design takes into account traffic capacity and traffic safety, improving the scientificity and adaptability of traffic planning by gradually adjusting the speed limit value.

[0023] As a preferred embodiment of the second aspect, the obtaining of the static traffic data of the base and the dynamic traffic data of the base is specifically as follows: The static traffic data of the base includes the number of lanes in the exit direction of the entrance and exit, the width of a single lane in the exit direction of the entrance and exit, the number of lanes in the oncoming direction from the left of the connecting road, the width of the outermost lane in the oncoming direction from the left of the connecting road, the total width of the exit lane and the median strip in the oncoming direction from the right of the connecting road, the width of the innermost lane at the entrance of the oncoming direction from the right of the connecting road, and the initial value of the intersection angle design between the entrance and exit and the road. The dynamic traffic data of the base includes the traffic flow at the base entrance and exit, the speed limit value, and the traffic flow and vehicle speed value of the connecting road of the base.

[0024] In the third aspect, the present application provides a computer-readable storage medium, which includes a stored computer program. Among them, when the computer program runs, it controls the device where the computer-readable storage medium is located to execute an optimization method for the setting of a base entrance and exit as described above. Its beneficial effects are the same as those of the optimization method for the setting of a base entrance and exit provided in the first aspect of the present application. Description of the Drawings

[0025] Figure 1 : A flowchart of an embodiment of the optimization method for the setting of a base entrance and exit provided by the present application; Figure 2 : A flowchart of an embodiment of the traffic entrance and exit setting process provided by the present application; Figure 3 : A structural schematic diagram of an embodiment of the sight triangle provided by the present application; Figure 4: Schematic structural diagram of an embodiment for calculating the sight triangle provided by the present application; Figure 5 : Schematic flow diagram of an embodiment of the optimization process for key parameters of the entrance and exit provided by the present application; Figure 6 : Schematic structural diagram of an embodiment of the optimization device for setting the base entrance and exit provided by the present application. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment 1 Please refer to Figure 1 , an optimization method for setting the base entrance and exit provided by the embodiment of the present invention.

[0028] In this embodiment, the process of the optimization method for setting the base entrance and exit in the present application is described in detail through steps S01 - S08.

[0029] As Figure 2 shown, the traffic entrance and exit setting process of the base of the present application is as follows: S01: Obtain the static traffic data of the base and the dynamic traffic data of the base according to the preset base entrance and exit setting scheme.

[0030] As a preferred embodiment of Embodiment 1, the obtaining of the static traffic data of the base and the dynamic traffic data of the base is specifically as follows: The static traffic data of the base includes the number of lanes in the exit direction of the entrance and exit, the width of a single lane in the exit direction of the entrance and exit, the number of lanes in the oncoming direction on the left side of the connecting road, the width of the outermost lane in the oncoming direction on the left side of the connecting road, the total width of the exit lane and the median strip in the oncoming direction on the right side of the connecting road, the width of the innermost lane at the entrance in the oncoming direction on the right side of the connecting road, and the initial value of the included angle design between the entrance and exit and the road; The dynamic traffic data of the base includes the traffic flow out of the base entrance and exit, the speed limit value, and the traffic flow and vehicle speed value of the connecting road of the base.

[0031] In this preferred embodiment, the present application provides a comprehensive and accurate basis for the optimization of the entrance and exit settings by obtaining the static traffic data and dynamic traffic data of the base. The static traffic data covers key parameters such as the number of lanes, lane width, median width, and initial design values of the included angle of the entrance and exit and the connecting roads, which lay the foundation for evaluating the rationality of the geometric design of the entrance and exit. The dynamic traffic data includes the traffic flow exiting the entrance and exit, speed limit values, and the traffic flow and vehicle speed values of the connecting roads, which reflect the actual traffic operation conditions and provide real-time basis for the evaluation of traffic capacity and speed limit optimization. By combining static and dynamic data, the present application can scientifically evaluate the rationality of the included angle between the entrance and exit and the road, and optimize the speed limit scheme accordingly, so as to improve the traffic flow efficiency while ensuring traffic safety. This process not only improves the scientificity and adaptability of the entrance and exit design, but also enhances the flexibility and safety of traffic planning through quantitative evaluation and optimization.

[0032] S02: Calculate the minimum included angle value between the entrance and exit and the road according to the preset driver visual characteristic factors, the static traffic data of the base, the dynamic traffic data of the base, and a preset first formula.

[0033] As a preferred embodiment of Embodiment 1, the calculating the minimum included angle value between the entrance and exit and the road according to the preset driver visual characteristic factors, the static traffic data of the base, the dynamic traffic data of the base, and a preset first formula is specifically as follows: According to the initial design value of the included angle between the entrance and exit and the road , select the corresponding formulas (preset first formula) for the vehicles turning left and right when exiting the entrance and exit to calculate the minimum value of the included angle of the entrance and exit, and obtain the limit minimum value .

[0034] In the formula: S ar , S al are respectively the stopping sight distances of the vehicles turning right when exiting the entrance and exit and the vehicles turning left, in m; S br , S bl are respectively the stopping sight distances of the oncoming vehicles from the left (conflicting vehicles observed by the vehicles turning right when exiting the entrance and exit) and the oncoming vehicles from the right (conflicting vehicles observed by the vehicles turning left when exiting the entrance and exit) on the connecting road, in m; as shown in Figure 3 ; , are respectively the visual field angles of the drivers of the vehicles turning right when exiting the entrance and exit and the drivers of the vehicles turning left, and the values are both 100 degrees, as shown in Figure 4 ; θ is the included angle between the entrance and exit and the road, is the initial design value of the included angle between the entrance and exit and the road, ( May not be reflected in Figure 4 and is one of the cases of θ), with the unit of degree.

[0035] Among them, the calculation model for the limit value of the angle between the entrance / exit and the road is: ; In the formula: is the maximum unilateral viewing angle under the comfortable and safe head turning of the driver, in degrees; is the minimum limit angle at which the entrance / exit intersects the road under the current design speed limit, in degrees; S a is the stopping sight distance of the vehicle exiting the entrance / exit; S b is the stopping sight distance of the oncoming vehicle on the connecting road, in m; It is the sum of the maximum head rotation angle in the natural state of the human body and the horizontal head-eye rotation angle in the natural state. Among them, according to the results of "Ergonomics" (Xiang Yinghua, Beijing Institute of Technology Press) and "Research on the Visible Area of BRT Drivers Based on Human Factors Engineering" (Bi Jun, Sichuan University Press), the maximum head rotation angle in the natural state of the human body takes a value of 50 degrees; according to the results of "Research on the Landscape Design Method and Evaluation System of High-Grade Highways" (Peng Wei, Journal of Chang'an University), the horizontal head-eye rotation angle in the natural state of the human body takes a value of 50 degrees. In summary, the maximum unilateral viewing angle under the comfortable and safe head turning of the driver takes a value of 100 degrees.

[0036] ; In this preferred embodiment, the present application calculates the minimum value of the angle between the base entrance / exit and the road by applying a preset first formula. This formula comprehensively considers the driver's field of view angle (both 100 degrees), the stopping sight distance of the vehicle exiting the entrance / exit (S ar , S al ) and the stopping sight distance of the oncoming vehicle on the connecting road (S br , S bl ). This method ensures that the entrance / exit design meets the visual needs and safety standards of the driver, thereby improving the scientificity and safety of traffic design. By accurately calculating the minimum angle value, the present application optimizes the entrance / exit setting and improves the efficiency of traffic flow and overall traffic safety.

[0037] S03: Compare the minimum angle value with the initial value of the angle between the entrance / exit and the road of the preset base. If the initial value is greater than or equal to the minimum angle value, calculate the result of the traffic capacity measurement of the base according to the preset second formula group.

[0038] As a preferred embodiment of the first embodiment, if the initial value is greater than or equal to the minimum included angle value, according to the preset second formula group, the calculation result of the traffic capacity of the base is obtained, specifically: According to the preset second formula group, the traffic capacity values of the connecting road at the base entrance and exit and the base entrance and exit are calculated.

[0039] The traffic capacity of the connecting road at the base entrance and exit is the maximum traffic capacity value based on the stopping sight distance of the vehicles on the connecting road; The traffic capacity value of the base entrance and exit is the minimum of the maximum traffic capacity based on the minimum stopping sight distance of the vehicles exiting the entrance and exit and the maximum traffic capacity value based on the available headway on the connecting road; The second formula group is: The initial traffic capacity Q of the connecting road of the base b is the maximum traffic capacity value based on the minimum stopping sight distance of the vehicles approaching from the connecting road of the base; the traffic capacity Q in the direction of vehicles exiting the entrance and exit a is the minimum of the maximum traffic capacity of the available headway on the connecting road of the base and the traffic capacity of the base entrance and exit based on the stopping sight distance.

[0040] ; ; In the formula, S i is the safe stopping sight distance of the vehicles at the base entrance and exit and the connecting road, m; V i is the driving speed of the vehicles at the base entrance and exit and the connecting road, km / h; t is the driver's braking reaction time, s; is the friction coefficient between the road surface and the tires of the connecting road at the base entrance and exit; h i is the longitudinal slope of the connecting road at the base entrance and exit; k is the braking coefficient; is the minimum safe distance between the vehicle and the obstacle after it comes to a complete stop, m; i is the traffic flow number, taking values of a (vehicles exiting the entrance and exit) and b (conflicting vehicles on the main road).

[0041] In the formula, is the maximum traffic capacity value under the safe stopping sight distance of the base, pcu / h; is the safe stopping sight distance of the vehicles on the connecting road at the base entrance and exit, m; is the driving speed of the vehicles on the connecting road at the base entrance and exit, km / h; is the maximum traffic capacity value of the base entrance and exit; The safety stopping sight distance at the base entrance and exit, m; The driving speed of vehicles at the base entrance and exit, km / h; The critical insertion gap for external road traffic flow, s, The headway when the traffic flow at the entrance and exit enters the external road, s.

[0042] In this preferred embodiment, by applying the preset second formula group, the present application can calculate the maximum traffic capacity value of the base under the minimum stopping sight distance and the minimum value of the traffic capacity of the entrance and exit based on the stopping sight distance. This calculation process takes into account the impact of the stopping sight distance on the traffic capacity, thus providing a scientific basis for evaluating whether the base has the condition to open the entrance and exit. Specifically, the maximum traffic capacity value under the minimum stopping sight distance ensures that vehicles can still pass through the entrance and exit safely and efficiently under the most unfavorable conditions; while the minimum value of the traffic capacity of the entrance and exit based on the stopping sight distance guarantees that the entrance and exit design has sufficient traffic capacity while meeting the safety requirements.

[0043] S04: Set the traffic capacity threshold values of the entrance and exit and the connecting road according to the traffic capacity measurement result.

[0044] S05: Compare the traffic capacity threshold value with the preset traffic demand. If the traffic demand is less than or equal to the traffic capacity threshold value, confirm that the preset base entrance and exit setting scheme is feasible and output the base entrance and exit setting scheme.

[0045] S06: If the initial value is less than the minimum included angle value or the traffic demand is greater than the traffic capacity threshold value, optimize the preset speed limit scheme of the base entrance and exit and the connecting road according to the preset optimization conditions to obtain an optimized base entrance and exit setting scheme.

[0046] As a preferred embodiment of Embodiment 1, when the initial value is less than the minimum included angle value or the traffic demand is greater than the traffic capacity threshold value, optimizing the preset speed limit scheme of the base entrance and exit and the connecting road according to the preset optimization conditions to obtain an optimized base entrance and exit setting scheme is specifically as follows: As Figure 5 shown, the key parameter optimization process is to optimize and adjust the speed limit value of the vehicles exiting the entrance and exit and the speed limit value of the vehicles on the connecting road with the traffic capacity of the entrance and exit as the constraint condition, and then optimize the included angle between the entrance and exit and the road; Judge whether the speed limit value of the base entrance and exit is greater than the preset first threshold value; If the speed limit value of the base entrance and exit is greater than the preset first threshold value, lower the speed limit value of the base entrance and exit by a preset gear value, keep the speed limit value of the connecting road unchanged, confirm that the optimization is completed, and obtain an optimized speed limit scheme; If the speed limit value of the base entrance and exit is less than or equal to a preset first threshold, determine whether the speed limit value of the connecting road is greater than a preset second threshold; If the speed limit value of the connecting road is less than or equal to the second threshold, confirm that the base does not have the opening condition; If the speed limit value of the connecting road is greater than the second threshold, lower the speed limit value of the connecting road by a preset gear value, keep the speed limit value of the base entrance and exit unchanged, and increment the preset number of times the speed limit of the connecting road is lowered by one; If the preset number of times the speed limit of the connecting road is lowered is less than or equal to two, confirm that the optimization is completed and obtain the optimized speed limit plan; if the preset number of times the speed limit of the connecting road is lowered is greater than two, confirm that the base does not have the opening condition.

[0047] Among them, the speed limit value V for exiting the entrance and exit a takes values that are multiples of 5 km / h, and is divided into 4 gears: 5 km / h, 10 km / h, 15 km / h, and 20 km / h; the speed limit value V of the connecting road b takes values that are multiples of 10 km / h, and is divided into 6 gears: 20 km / h, 30 km / h, 40 km / h, 50 km / h, and 60 km / h. The higher the speed, the higher the level, and each level takes a value of one gear. The specific key parameter optimization steps include: 4.1.1. Evaluate whether the speed limit value V for exiting the entrance and exit a is greater than 5 km / h. If V a > 5 km / h, then proceed to step 4.1.2; if V a ≤ 5 km / h, then proceed to step 4.1.4; 4.1.2. Lower the speed limit Va for exiting the entrance and exit by one gear, and keep the connecting road V b unchanged; 4.1.3. Conduct a measurement of the angle model between the entrance and exit and the road to obtain a new minimum angle value , and if the angle between the entrance and exit and the connecting road ≥ , then proceed to the measurement step 4.1.6 of the traffic capacity measurement model; < , then return to step 4.1.1; 4.1.4. Determine whether the speed limit V of the connecting road b is greater than 20 km / h. If V b ≤ 20 km / h, the entrance and exit do not have the opening condition, and directly proceed to step 4.1.7; if V b > 20 km / h, then proceed to step 4.1.5; 4.1.5. When V b> 20 km / h, the speed limit Va for exiting at the entrance and exit remains unchanged, and the connecting road speed is V b Downshift one gear, V b The number of gears E by which the vehicle speed decreases b +1 (the number of gears E by which the vehicle speed decreases b The initial value is 0). If E b > 2, the entrance and exit do not have the opening condition, and directly enter step 4.1.7; if E b ≤ 2, then enter the calculation step 4.1.6 of the traffic capacity model; 4.1.6. Calculate the traffic capacity model formula to obtain the optimized traffic capacity Q in the exit direction of the entrance and exit and the traffic capacity Q of the connecting road a and the traffic capacity Q of the connecting road b , and make a comparison and judgment on the calculation results: When q a ≤ Q a * 0.9 and q b ≤ Q b * 0.8, it has the opening condition and directly enters step 4.1.7; When q a > Q a * 0.9 or q b > Q b * 0.8, directly enter step 4.1.1; 4.1.7 The speed V of the connecting road b 、q b 、Q b are the speeds V of the oncoming vehicles on the connecting road in the sight triangle where the vehicle exiting needs to turn right br 、q br Q br , and the rationality judgment of the included angle between the entrance and exit and the road is shown in the following table: In this preferred embodiment, when the present application evaluates the included angle between the entrance and exit and the road, if the calculated minimum included angle is less than the minimum value, it indicates that the current design may affect traffic safety and efficiency. Therefore, by optimizing the preset key speed limit parameters and adjusting the vehicle driving speed to adapt to the smaller included angle, the safety and smoothness of the traffic flow are ensured. This optimization process not only improves the flexibility and adaptability of the design, but also enhances the overall performance of the traffic system by scientifically adjusting the speed limit parameters, thereby maximizing the traffic capacity of the traffic flow on the premise of ensuring safety.

[0048] S07: Obtain the static traffic data of the optimized base entrance and exit setting scheme and the dynamic traffic data of the base according to the preset optimization conditions.

[0049] S08: According to the static traffic data of the optimized base entrance and exit setting plan, the dynamic traffic data of the base, the preset first formula, and the preset second formula group, calculate the minimum angle between the base entrance and exit and the road and the traffic capacity value, and evaluate the feasibility of the optimized base entrance and exit setting plan.

[0050] S09: If the optimized base entrance and exit setting plan does not meet the preset optimization conditions, it is determined that the base does not have the opening conditions.

[0051] This application calculates the minimum value of the angle between the entrance and exit and the road and the traffic capacity by obtaining the static and dynamic traffic data of the base and combining the driver's visual characteristic factors and the preset formula. If the initial value of the angle is greater than or equal to the minimum value and the traffic capacity meets the traffic demand, it is confirmed that the preset entrance and exit setting plan is feasible; otherwise, the speed limit plan is optimized and the optimized plan is re-evaluated. If the optimized plan still does not meet the conditions, it is determined that the base does not have the opening conditions. This process ensures the rationality and safety of the entrance and exit settings through scientific quantitative evaluation and optimization, improves the scientificity and adaptability of traffic design, and this application solves the problem in the prior art that the traffic entrance and exit of the base cannot be accurately set.

[0052] Embodiment 2 Please refer to Figure 6 , which is an optimization device for the base entrance and exit setting provided by the embodiment of this application.

[0053] In this embodiment, the optimization device for the base entrance and exit setting includes an acquisition module 10, an evaluation module 20, and an optimization module 30.

[0054] As Figure 2 shown, it is the traffic entrance and exit setting process of the base of this application: The acquisition module 10 is used to obtain the static traffic data and the dynamic traffic data of the base according to the preset base entrance and exit setting plan.

[0055] As a preferred embodiment of Embodiment 2, the obtaining of the static traffic data and the dynamic traffic data of the base is specifically: The static traffic data of the base includes the number of lanes in the exit direction of the entrance and exit, the width of a single lane in the exit direction of the entrance and exit, the number of lanes in the oncoming direction on the left side of the connecting road, the width of the outermost lane in the oncoming direction on the left side of the connecting road, the total width of the exit lane and the median strip in the oncoming direction on the right side of the connecting road, the width of the innermost lane at the entrance in the oncoming direction on the right side of the connecting road, and the initial design value of the intersection angle between the entrance and exit and the road; The dynamic traffic data of the base includes the traffic flow out of the base entrance and exit, the speed limit value, and the traffic flow and vehicle speed value of the connecting road of the base.

[0056] In this preferred embodiment, the present application provides a comprehensive and accurate basis for optimizing the settings of entrances and exits by obtaining the static traffic data and dynamic traffic data of the base. The static traffic data covers key parameters such as the number of lanes, lane width, median width, and initial design values of the included angle of the entrances and exits and the connecting roads, which lay the foundation for evaluating the rationality of the geometric design of the entrances and exits. The dynamic traffic data includes the traffic flow exiting the entrances and exits, speed limit values, as well as the traffic flow and vehicle speed values of the connecting roads, which reflect the actual traffic operation conditions and provide real-time basis for the evaluation of traffic capacity and speed limit optimization. By combining the static and dynamic data, the present application can scientifically evaluate the rationality of the included angle between the entrances and exits and the roads, and accordingly optimize the speed limit scheme, so as to improve the traffic flow efficiency on the premise of ensuring traffic safety. This process not only enhances the scientific nature and adaptability of the entrance and exit design, but also strengthens the flexibility and safety of traffic planning through quantitative evaluation and optimization.

[0057] The evaluation module 20 is used to calculate the minimum included angle value between the entrance and exit and the road according to the preset driver visual characteristic factors, the static traffic data of the base, the dynamic traffic data of the base, and a preset first formula.

[0058] As a preferred embodiment of Embodiment 2, the calculating the minimum included angle value between the entrance and exit and the road according to the preset driver visual characteristic factors, the static traffic data of the base, the dynamic traffic data of the base, and a preset first formula is specifically as follows: According to the initial design value of the included angle between the entrance and exit and the road , select the corresponding formulas (preset first formula) for the vehicles turning left and right when exiting the entrance and exit to calculate the minimum value of the included angle of the entrance and exit, and obtain the limit minimum value .

[0059] In the formula: S ar , S al are respectively the stopping sight distances of the vehicles turning right when exiting the entrance and exit and the vehicles turning left, in m; S br , S bl are respectively the stopping sight distances of the oncoming vehicles from the left (conflicting vehicles observed by the vehicles turning right when exiting the entrance and exit) and the oncoming vehicles from the right (conflicting vehicles observed by the vehicles turning left when exiting the entrance and exit) on the connecting road, in m; as Figure 3 shown; , are respectively the field of vision angles of the drivers of the vehicles turning right when exiting the entrance and exit and the drivers of the vehicles turning left, both taking the value of 100 degrees, as Figure 4 shown, θ is the included angle between the entrance and exit and the road, is the initial design value of the included angle between the entrance and exit and the road, ( May not be reflected in Figure 4 ; is one of the cases of θ), and the unit is degree.

[0060] Among them, the calculation model for the limit value of the included angle between the entrance / exit and the road is: ; In the formula: is the maximum unilateral viewing angle under the comfortable and safe head turning of the driver, in degrees; is the limit minimum included angle when the entrance / exit intersects with the road under the current design speed limit, in degrees; S a is the stopping sight distance of the vehicle exiting the entrance / exit; S b is the stopping sight distance of the oncoming vehicle on the connecting road, in m; It is the sum of the maximum head rotation angle in the natural state of the human body and the horizontal head eye rotation angle in the natural state. Among them, according to the results of "Ergonomics" (Xiang Yinghua, Beijing Institute of Technology Press) and ("Research on the Visible Area of BRT Drivers Based on Human Factors Engineering" (Bi Jun, Sichuan University Press)), the maximum head rotation angle in the natural state of the human body takes a value of 50 degrees; according to the results of "Research on the Landscape Design Method and Evaluation System of High-Grade Highways" (Peng Wei, Journal of Chang'an University), the horizontal head eye rotation angle in the natural state of the human body takes a value of 50 degrees. In summary, the maximum unilateral viewing angle under the comfortable and safe head turning of the driver takes a value of 100 degrees.

[0061] ; In this preferred embodiment, the present application calculates the minimum value of the included angle between the base entrance / exit and the road by applying a preset first formula. This formula comprehensively considers the driver's field of view angle (both are 100 degrees), the stopping sight distance of the vehicle exiting the entrance / exit (S ar , S al ) and the stopping sight distance of the oncoming vehicle on the connecting road (S br , S bl ). This method ensures that the entrance / exit design meets the visual needs and safety standards of the driver, thereby improving the scientificity and safety of traffic design. By accurately calculating the minimum value of the included angle, the present application optimizes the entrance / exit setting and improves the efficiency of traffic flow and overall traffic safety.

[0062] The evaluation module 20 is further configured to compare the minimum included angle value with the initial value of the included angle between the entrance / exit of the preset base and the road. If the initial value is greater than or equal to the minimum included angle value, according to the preset second formula group, the calculation result of the traffic capacity of the base is obtained.

[0063] As a preferred embodiment of the second embodiment, if the initial value is greater than or equal to the minimum included angle value, according to the preset second formula group, the calculation result of the traffic capacity of the base is obtained, specifically: According to the preset second formula group, the traffic capacity values of the connecting road at the base entrance and exit and the base entrance and exit are calculated.

[0064] The traffic capacity of the connecting road at the base entrance and exit is the maximum traffic capacity value based on the stopping sight distance of the vehicles on the connecting road; The traffic capacity value of the base entrance and exit is the minimum value of the maximum traffic capacity based on the minimum stopping sight distance of the vehicles exiting the entrance and exit and the maximum traffic capacity value based on the available headway on the connecting road; The second formula group is: The initial traffic capacity Q of the connecting road of the base b is the maximum traffic capacity value based on the minimum stopping sight distance of the vehicles approaching from the connecting road of the base; the traffic capacity Q in the direction of vehicles exiting the entrance and exit a is the minimum value of the maximum traffic capacity of the available headway on the connecting road of the base and the traffic capacity of the base entrance and exit based on the stopping sight distance.

[0065] ; ; In the formula, S i is the safe stopping sight distance of the vehicles at the base entrance and exit and the connecting road, m; V i is the driving speed of the vehicles at the base entrance and exit and the connecting road, km / h; t is the driver's braking reaction time, s; is the friction coefficient between the road surface and the tires of the connecting road at the base entrance and exit; h i is the longitudinal slope of the connecting road at the base entrance and exit; k is the braking coefficient; is the minimum safe distance between the vehicle and the obstacle after it has come to a complete stop, m; i is the traffic flow number, taking values of a (vehicles exiting the entrance and exit) and b (conflicting vehicles on the main road).

[0066] In the formula, is the maximum traffic capacity value at the safe stopping sight distance of the base, pcu / h; is the safe stopping sight distance of the vehicles on the connecting road at the base entrance and exit, m; is the driving speed of the vehicles on the connecting road at the base entrance and exit, km / h; is the maximum traffic capacity value of the base entrance and exit; is the safe stopping sight distance at the base entrance / exit, in m; is the driving speed of vehicles at the base entrance / exit, in km / h; is the critical insertion gap for external road traffic flow, in s, is the headway when the vehicle flow at the entrance / exit enters the external road, in s.

[0067] In this preferred embodiment, the present application can calculate the maximum traffic capacity value of the base under the minimum stopping sight distance and the minimum traffic capacity of the entrance / exit based on the stopping sight distance by applying a preset second formula group. This calculation process takes into account the impact of the stopping sight distance on the traffic capacity, thereby providing a scientific basis for evaluating whether the base meets the conditions for opening the entrance / exit. Specifically, the maximum traffic capacity value under the minimum stopping sight distance ensures that vehicles can still pass through the entrance / exit safely and efficiently under the most unfavorable conditions; while the minimum traffic capacity of the entrance / exit based on the stopping sight distance guarantees that the entrance / exit design has sufficient traffic capacity while meeting safety requirements.

[0068] The evaluation module 20 is also used to set the traffic capacity thresholds for the entrance / exit and the connecting road according to the traffic capacity measurement result; Compare the traffic capacity threshold with the preset traffic demand. If the traffic demand is less than or equal to the traffic capacity threshold, confirm that the preset base entrance / exit setting plan is feasible and output the base entrance / exit setting plan; If the initial value is less than the minimum included angle value or the traffic demand is greater than the traffic capacity threshold, optimize the preset speed limit plan for the base entrance / exit and the connecting road according to the preset optimization conditions to obtain an optimized base entrance / exit setting plan.

[0069] As a preferred embodiment of the second embodiment, the step of optimizing the preset speed limit plan for the base entrance / exit and the connecting road according to the preset optimization conditions to obtain an optimized base entrance / exit setting plan when the initial value is less than the minimum included angle value or the traffic demand is greater than the traffic capacity threshold is specifically as follows: As Figure 5 shown, the key parameter optimization process is to optimize and adjust the speed limit value of the vehicles exiting the entrance / exit and the speed limit value of the vehicles on the connecting road with the traffic capacity of the entrance / exit as the constraint condition, and then optimize the included angle between the entrance / exit and the road; Judge whether the speed limit value of the base entrance / exit is greater than a preset first threshold; If the speed limit value of the base entrance / exit is greater than the preset first threshold, lower the speed limit value of the base entrance / exit by a preset gear value, keep the speed limit value of the connecting road unchanged, confirm that the optimization is completed, and obtain an optimized speed limit plan; If the speed limit value at the base entrance and exit is less than or equal to a preset first threshold, determine whether the speed limit value of the connecting road is greater than a preset second threshold; If the speed limit value of the connecting road is less than or equal to the second threshold, confirm that the base does not have the opening condition; If the speed limit value of the connecting road is greater than the second threshold, lower the speed limit value of the connecting road by a preset gear value, keep the speed limit value at the base entrance and exit unchanged, and increment the preset number of times the speed limit of the connecting road is lowered by one; If the preset number of times the speed limit of the connecting road is lowered is less than or equal to two, confirm that the optimization is completed and obtain the optimized speed limit plan; if the preset number of times the speed limit of the connecting road is lowered is greater than two, confirm that the base does not have the opening condition.

[0070] Among them, the speed limit value V when exiting the entrance and exit a takes values that are multiples of 5 km / h, and is divided into 4 gears: 5 km / h, 10 km / h, 15 km / h, and 20 km / h; the speed limit value V of the connecting road b takes values that are multiples of 10 km / h, and is divided into 6 gears: 20 km / h, 30 km / h, 40 km / h, 50 km / h, and 60 km / h. The higher the speed, the higher the level, and each level is a gear value. The specific key parameter optimization steps include: 4.1.1. Evaluate whether the speed limit value V when exiting the entrance and exit a is greater than 5 km / h. If V a > 5 km / h, then go to step 4.1.2; if V a ≤ 5 km / h, then go to step 4.1.4; 4.1.2. Lower the speed limit Va when exiting the entrance and exit by one gear, and keep the connecting road V b unchanged; 4.1.3. Conduct a calculation of the angle model between the entrance and exit and the road to obtain a new minimum angle value , and if the angle between the entrance and exit and the connecting road ≥ , then go to the calculation step 4.1.6 of the traffic capacity calculation model; < , then return to step 4.1.1; 4.1.4. Determine whether the speed limit V of the connecting road b is greater than 20 km / h. If V b ≤ 20 km / h, the entrance and exit do not have the opening condition, and directly go to step 4.1.7; if V b > 20 km / h, then enter step 4.1.5; 4.1.5. When V b > 20 km / h, the speed limit Va when exiting the entrance and exit remains unchanged, and the connecting road Vb Downshift by one gear, V b Number of gears E for vehicle speed to decrease b +1 (number of gears E for vehicle speed to decrease b with an initial value of 0). If E b > 2, the access does not have the opening condition, and directly go to step 4.1.7; if E b ≤ 2, then enter the calculation step 4.1.6 of the traffic capacity model; 4.1.6. Calculate the traffic capacity model formula to obtain the optimized traffic capacity Q of the exit direction of the access and the traffic capacity Q a of the connecting road b , and compare and judge the calculation results: When q a ≤ Q a * 0.9 and q b ≤ Q b * 0.8, the opening condition is met, and directly go to step 4.1.7; When q a > Q a * 0.9 or q b > Q b * 0.8, directly go to step 4.1.1; 4.1.7 Connecting road vehicle speed V b , q b , Q b are the vehicle speeds V br , q br Q br of the oncoming vehicles on the connecting road in the sight triangle for the vehicle exiting the access to turn right. The rationality determination of the included angle between the access and the road is shown in the following table: In this preferred embodiment, when the present application evaluates the included angle between the access and the road, if the calculated minimum included angle is less than the minimum value, it indicates that the current design may affect traffic safety and efficiency. Therefore, by optimizing the preset key speed limit parameters, adjusting the vehicle driving speed to adapt to the smaller included angle, and ensuring the safety and smoothness of the traffic flow. This optimization process not only improves the flexibility and adaptability of the design, but also improves the overall performance of the traffic system by scientifically adjusting the speed limit parameters, thereby maximizing the traffic capacity of the traffic flow on the premise of ensuring safety.

[0071] The optimization module 30 is used to obtain the static traffic data of the optimized base access setting scheme and the dynamic traffic data of the base according to the preset optimization conditions; Based on the static traffic data of the optimized base entrance and exit setting plan, the dynamic traffic data of the base, the preset first formula, and the preset second formula group, calculate the minimum angle between the base entrance and exit and the road and the traffic capacity value, and evaluate the feasibility of the optimized base entrance and exit setting plan; If the optimized base entrance and exit setting plan does not meet the preset optimization conditions, it is determined that the base does not have the opening conditions.

[0072] In this application, by obtaining the static and dynamic traffic data of the base and combining the driver's visual characteristic factors and preset formulas, the minimum value of the angle between the entrance and exit and the road and the traffic capacity are calculated. If the initial angle is greater than or equal to the minimum value and the traffic capacity meets the traffic demand, it is confirmed that the preset entrance and exit setting plan is feasible; otherwise, the speed limit plan is optimized and the optimized plan is re-evaluated. If the optimized plan still does not meet the conditions, it is determined that the base does not have the opening conditions. This process ensures the rationality and safety of the entrance and exit settings through scientific quantitative evaluation and optimization, improves the scientific nature and adaptability of traffic design, and this application solves the problem in the prior art that the traffic entrance and exit of the base cannot be accurately set.

[0073] Embodiment 3: The embodiment of the present application provides a computer-readable storage medium, and the computer-readable storage medium includes a stored computer program, wherein when the computer program runs, it controls the device where the computer-readable storage medium is located to execute the optimized method for setting the base entrance and exit; Among them, for the optimized method for setting the base entrance and exit, if it is implemented in the form of a software functional unit and used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the processes in the above embodiment methods of the present invention, it can also be completed by a computer program instructing relevant hardware. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-mentioned various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0074] The specific embodiments described above further elaborate on the objective, technical solution, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. In particular, it is pointed out that for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An optimization method for the setting of base entrances and exits, characterized in that, Including: Obtain the static traffic data and dynamic traffic data of the base according to the preset base entrance and exit setting scheme; Calculate the minimum included angle value between the entrance and exit and the road according to the preset driver visual characteristic factors, the static traffic data of the base, the dynamic traffic data of the base, and the preset first formula; Compare the minimum included angle value with the initial value of the included angle between the entrance and exit of the preset base and the road. If the initial value is greater than or equal to the minimum included angle value, calculate the traffic capacity measurement result of the base according to the preset second formula group; Set the traffic capacity threshold of the entrance and exit and the connecting road according to the traffic capacity measurement result; Compare the traffic capacity threshold with the preset traffic demand. If the traffic demand is less than or equal to the traffic capacity threshold, confirm that the preset base entrance and exit setting scheme is feasible and output the base entrance and exit setting scheme; If the initial value is less than the minimum included angle value or the traffic demand is greater than the traffic capacity threshold, optimize the preset base entrance and exit and connecting road speed limit scheme according to the preset optimization conditions to obtain an optimized base entrance and exit setting scheme; Obtain the static traffic data and dynamic traffic data of the optimized base entrance and exit setting scheme according to the preset optimization conditions; Calculate the minimum included angle and traffic capacity value between the base entrance and exit and the road according to the static traffic data, dynamic traffic data, preset first formula, and preset second formula group of the optimized base entrance and exit setting scheme, and evaluate the feasibility of the optimized base entrance and exit setting scheme; If the optimized base entrance and exit setting scheme does not meet the preset optimization conditions, determine that the base does not have the opening condition.

2. The optimization method for the base entrance and exit setting according to claim 1, characterized in that, The optimization of the preset base entrance and exit and connecting road speed limit scheme to obtain an optimized base entrance and exit setting scheme is specifically: The parameters for optimizing the preset base entrance and exit and connecting road speed limit scheme include the preset base entrance and exit speed limit value and the connecting road speed limit value; Judge whether the base entrance and exit speed limit value is greater than the preset first threshold; If the base entrance and exit speed limit value is greater than the preset first threshold, lower the base entrance and exit speed limit value by a preset gear value, keep the connecting road speed limit value unchanged, confirm that the optimization is completed, and obtain an optimized speed limit scheme; If the base entrance and exit speed limit value is less than or equal to the preset first threshold, judge whether the connecting road speed limit value is greater than the preset second threshold; If the connecting road speed limit value is less than or equal to the second threshold, confirm that the base does not have the opening condition; If the connecting road speed limit value is greater than the second threshold, lower the connecting road speed limit value by a preset gear value, keep the base entrance and exit speed limit value unchanged, and increase the preset number of times of lowering the connecting road speed limit by one; If the preset number of times of lowering the connecting road speed limit is less than or equal to two, confirm that the optimization is completed and obtain an optimized speed limit scheme; if the preset number of times of lowering the connecting road speed limit is greater than two, confirm that the base does not have the opening condition.

3. The optimization method for the base entrance and exit setting according to claim 1, characterized in that, The obtaining of the static traffic data and dynamic traffic data of the base is specifically: The static traffic data of the base includes the number of lanes in the exit direction of the entrance and exit, the width of a single lane in the exit direction of the entrance and exit, the number of lanes in the oncoming direction from the left of the connecting road, the width of the outermost lane in the oncoming direction from the left of the connecting road, the total width of the exit lane and the median strip in the oncoming direction from the right of the connecting road, the width of the innermost lane at the entrance in the oncoming direction from the right of the connecting road, and the initial value of the intersection angle between the entrance and exit and the road at the design stage; The dynamic traffic data of the base includes the traffic flow exiting from the base entrance and exit, the speed limit value, and the traffic flow and vehicle speed values of the connecting road of the base.

4. The optimization method for the base access point setting according to claim 1, characterized in that, Based on the preset driver visual characteristic factors, the static traffic data of the base, the dynamic traffic data of the base, and a preset first formula, the minimum included angle value of the initial intersection angle between the entrance and exit and the road is calculated, specifically as follows: The preset first formula is as follows: ; In the formula, and are respectively the driver's vision angles of the vehicles that need to turn right and the driver's vision angles of the vehicles that need to turn left when driving out of the entrance and exit of the said base; S ar and S al are respectively the stopping sight distances of the vehicles that need to turn right and the stopping sight distances of the vehicles that need to turn left when driving out of the entrance and exit of the said base; S br and S bl are respectively the stopping sight distances of the vehicles coming from the left and the vehicles coming from the right on the connecting road of the said base; is the initial value of the angle between the entrance and exit of the preset base and the road; is the minimum value of the angle between the initial entrance and exit and the road; Based on the preset first formula, the minimum included angle value of the initial intersection angle between the entrance and exit and the road is calculated.

5. The optimization method for the base entrance and exit setting according to claim 1, characterized in that, Based on a preset second formula group, the calculation result of the traffic capacity of the base is obtained, specifically as follows: Based on the preset second formula group, the traffic capacity values of the connecting road of the base entrance and exit and the base entrance and exit are calculated; Among them, the traffic capacity of the connecting road of the base entrance and exit is the maximum traffic capacity value based on the stopping sight distance of the vehicles on the connecting road; The traffic capacity value of the base entrance and exit is the minimum of the maximum traffic capacity based on the minimum stopping sight distance of the vehicles exiting the entrance and exit and the maximum traffic capacity based on the available headway on the connecting road.

6. The optimization method for the base entrance and exit setting according to claim 5, characterized in that, The preset second formula group is specifically as follows: ； Where S i is the safe stopping sight distance of the vehicles at the entrances and exits of the base and on the connecting roads; V i is the driving speed of the vehicles at the entrances and exits of the base and on the connecting roads. t is the driver's braking reaction time; is the friction coefficient between the road surface and the tire of the access road connecting to the base; h i is the longitudinal slope of the access road connecting to the base; k is the braking coefficient; is the minimum safety distance between the vehicle and the obstacle after it comes to a complete stop; i is the traffic flow number; ； In the formula, is the maximum traffic capacity value under the safe stopping sight distance of the base; is the safe stopping sight distance of the vehicles on the connecting road at the base entrance and exit; is the driving speed of the vehicles on the connecting road at the base entrance and exit; is the maximum passing capacity value of the entrance and exit of the said base; is the safe stopping sight distance at the base entrance and exit; is the driving speed of vehicles at the base entrance and exit; is the critical gap that the external road traffic flow can insert, is the headway when the traffic flow at the entrance and exit enters the external road.

7. An optimization device for the setting of the base entrance and exit, characterized in that, It includes an acquisition module, an evaluation module, and an optimization module: The acquisition module is used to obtain the static traffic data and the dynamic traffic data of the base according to a preset base entrance and exit setting plan; The evaluation module is used to calculate the minimum included angle value of the intersection angle between the entrance and exit and the road based on the preset driver visual characteristic factors, the static traffic data of the base, the dynamic traffic data of the base, and a preset first formula; Compare the minimum included angle value with the initial value of the intersection angle between the entrance and exit and the road of the preset base. If the initial value is greater than or equal to the minimum included angle value, calculate the calculation result of the traffic capacity of the base according to the preset second formula group; Set the traffic capacity threshold values of the entrance and exit and the connecting road according to the traffic capacity calculation result; Compare the traffic capacity threshold value with the preset traffic demand. If the traffic demand is less than or equal to the traffic capacity threshold value, the preset base entrance and exit setting plan is feasible; Output the base entrance and exit setting plan; If the initial value is less than the minimum included angle value or the traffic demand is greater than the traffic capacity threshold value, optimize the preset speed limit plan for the base entrance and exit and the connecting road according to the preset optimization conditions to obtain an optimized base entrance and exit setting plan; The optimization module is used to obtain the static traffic data and the dynamic traffic data of the optimized base entrance and exit setting plan according to the preset optimization conditions; According to the static traffic data of the optimized base access setting scheme, the dynamic traffic data of the base, the preset first formula, and the preset second formula group, calculate the minimum angle between the base access and the road and the traffic capacity value, and evaluate the feasibility of the optimized base access setting scheme; If the optimized base access setting scheme does not meet the preset optimization conditions, it is determined that the base does not have the opening conditions.

8. The optimization device for the base entrance and exit setting according to claim 7, characterized in that The optimization of the preset base access and the connecting road speed limit scheme to obtain an optimized base access setting scheme is specifically as follows: The parameters for optimizing the preset base access and the connecting road speed limit scheme include the preset base access speed limit value and the connecting road speed limit value; Judge whether the base access speed limit value is greater than a preset first threshold; If the base access speed limit value is greater than the preset first threshold, lower the base access speed limit value by a preset gear value, keep the connecting road speed limit value unchanged, confirm that the optimization is completed, and obtain an optimized speed limit scheme; If the base access speed limit value is less than or equal to the preset first threshold, judge whether the connecting road speed limit value is greater than a preset second threshold; If the connecting road speed limit value is less than or equal to the second threshold, confirm that the base does not have the opening conditions; If the connecting road speed limit value is greater than the second threshold, lower the connecting road speed limit value by a preset gear value, keep the base access speed limit value unchanged, and increase the preset number of times of lowering the connecting road speed limit by one; If the preset number of times of lowering the connecting road speed limit is less than or equal to two, confirm that the optimization is completed and obtain an optimized speed limit scheme; if the preset number of times of lowering the connecting road speed limit is greater than two, confirm that the base does not have the opening conditions.

9. The optimization device for the base access point setting according to claim 7, characterized in that, The obtaining of the static traffic data of the base and the dynamic traffic data of the base is specifically as follows: The static traffic data of the base includes the number of lanes in the exit direction of the access, the width of a single lane in the exit direction of the access, the number of lanes in the oncoming direction from the left of the connecting road, the width of the outermost lane in the oncoming direction from the left of the connecting road, the total width of the exit lane and the median strip in the oncoming direction from the right of the connecting road, the width of the innermost lane at the entrance in the oncoming direction from the right of the connecting road, and the initial value of the intersection angle between the access and the road; The dynamic traffic data of the base includes the traffic flow exiting from the base access, the speed limit value, and the traffic flow and vehicle speed value of the connecting road of the base.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored computer program, wherein when the computer program runs, it controls the device where the computer-readable storage medium is located to execute the optimization method for base access setting as described in any one of claims 1 to 6.

Images