Pedestrian crossing control method for road section with serious pedestrian-vehicle conflict

Abstract

The invention provides a pedestrian crossing management and control method for a road section with serious pedestrian-vehicle conflict, and belongs to the technical field of road traffic management and control, quantitative research is performed on setting conditions for controlling pedestrian crossing by using signal lamps on two-way four lanes and two-way six lanes through visim, and a recommended timing scheme is given according to related theories, so that the pedestrian crossing management and control method is provided for the road section with serious pedestrian-vehicle conflict. The traffic characteristics, the application conditions and the post-operation effect are subjected to simulation research, and a signal management control scheme suitable for road sections with serious pedestrian-vehicle conflicts is provided, so that the driving delay can be effectively reduced on the premise of ensuring the safety of pedestrians crossing the street, and the traffic safety of the pedestrians crossing the street is improved. According to the scheme, the pedestrian-vehicle conflict at the pedestrian crossing position of the road section can be effectively relieved, the pedestrian-vehicle conflict accident is avoided, the traffic flow passing capacity of the road section is improved, the road safety and smoothness are improved, important social benefits are brought, the social benefits are often difficult to quantify, but the social benefits are crucial from the long-term view, and the method is worthy of popularization and application. And the method has very important practical significance.

Description

Technical Field

[0001] The invention belongs to the technical field of road traffic management and control, and relates to a pedestrian crossing control method for a road section with serious conflicts between pedestrians and vehicles. Background Art

[0002] In recent years, the construction of transportation facilities has been a key link in my country's development and construction. The density of my country's road network has increased significantly compared to the early days of the founding of the People's Republic of China, and the per capita car ownership and travel demand have also increased significantly. This growth has inevitably brought conflicts between pedestrians and vehicles crossing the street on the road. In conflicts, pedestrians crossing the street, as a large number of unprotected traffic participants in the entire transportation system, are more vulnerable to harm in conflicts. In order to protect pedestrians, the relevant legislative departments have written "cars give way to pedestrians" into traffic laws and regulations. Article 47 of the "Road Traffic Safety Law of the People's Republic of China" stipulates: "When a motor vehicle passes a crosswalk, it shall slow down; when a pedestrian is crossing the crosswalk, it shall stop and give way. When a motor vehicle is traveling on a road without traffic signals, it shall give way to pedestrians crossing the road."

[0003] However, in some cases, the "cars give way to pedestrians" rule is not the optimal solution. For example, if the "cars give way to pedestrians" rule is still used when there are many pedestrians crossing the street, the continuous flow of pedestrians will block the road section, and the traffic flow will be greatly affected. At such locations, traffic lights will be set up to divide a cycle into a pedestrian crossing phase and a vehicle passing phase. The book "Traffic Design" compiled by Professor Yang Xiaoguang and others mentioned: At intersections where the flow of pedestrians crossing the main and secondary roads of the city is large and it is not appropriate to set up pedestrian bridges or tunnels, a dedicated pedestrian crossing signal can be set up, and the phase duration should be determined according to the time required for pedestrians to cross the street.

[0004] However, there is only a qualitative description of the conditions for setting up traffic lights, and a lack of quantitative research. Relevant departments often set up traffic lights for control only when they see that vehicle traffic is seriously obstructed, and the timing plans lack scientificity. Summary of the invention

[0005] Based on the above analysis, the present invention discloses a pedestrian crossing control method for road sections with serious conflicts between pedestrians and vehicles, which not only ensures the safety of pedestrians crossing the street, but also does not reduce or even improves the traffic capacity of the road.

[0006] The present invention adopts the following technical solutions to solve the above problems:

[0007] A method for controlling pedestrian crossing on a road section with serious conflicts between pedestrians and vehicles, the method comprising the following steps:

[0008] S1: Calculate the headway distance at different design vehicle speeds based on road design specifications and different pedestrian walking speeds;

[0009] S2: Calculate the ratio based on the average delay time of traffic flow before and after setting the traffic lights, which is defined as the necessity of setting the lights;

[0010] S3: Simulate different traffic volume conditions through the simulation system, and then output the average delay of vehicles before and after the lights are set for comparison;

[0011] S4: Design a method for pedestrian crossing control based on the simulation results.

[0012] Furthermore, in S1, if the headway distance is greater than 4.4 seconds, the formula Vh t =3.6h d .Calculate the requirements for headway under different design speeds. If pedestrians are required to cross the street freely, some pedestrians can only wait before finding a suitable opportunity to cross the street. If the waiting time exceeds the threshold, they may choose to cross the street at risk, causing safety hazards. At this time, you should consider installing traffic lights to assist pedestrians in crossing the street.

[0013] Furthermore, in S2, when the necessity of installing traffic lights exceeds 1, it means that the average delay of traffic flow after installing traffic lights is lower than that before installing traffic lights. In this case, setting traffic lights to control traffic flow and pedestrians on the road section can not only improve the safety of pedestrians crossing the street, but also reduce the average delay, improve traffic efficiency and road capacity, and setting traffic lights can be considered to alleviate conflicts.

[0014] Furthermore, when the necessity of setting up lights exceeds 1, it is possible to consider setting up traffic lights to control the traffic flow and pedestrians crossing the road section. The timing of the signal lights must take into account the waiting time threshold of pedestrians crossing the street, the walking speed of the elderly, and the characteristics of accelerating the crossing, and the vehicle traffic efficiency must be increased as much as possible while ensuring the safety of pedestrians.

[0015] Furthermore, in S3, the simulation system uses the vissim simulation system to calculate the two-way four-lane road section and the two-way six-lane road section, and the one-way traffic volume is 1000 to 2000 vehicles / h.

[0016] Furthermore, under different numbers of lanes and traffic volumes, assuming that the compliance rate of pedestrians and vehicles to control is 100%, the necessity of installing a traffic light is greater than 1 when the pedestrian flow exceeds the following values. In some cases, the necessity may even exceed 1.8. For example, in a two-way four-lane road with a one-way traffic volume of 1600 and a pedestrian flow of 600, the average delay before the traffic light is 16.83s / vehicle, and the average delay after the traffic light is 9.22s / vehicle. The necessity of installing a traffic light is approximately 1.83.

[0017] Furthermore, for tidal sections that meet the conditions for setting up traffic lights, the differences in traffic demand changes in different time periods should be taken into consideration, and this control measure should be implemented in specific time periods, starting with implementation during peak hours and resuming during off-peak hours to maximize traffic benefits.

[0018] Compared with the prior art, the present invention has the following characteristics:

[0019] The present invention will conduct a quantitative study on the setting conditions of using traffic lights to control pedestrian crossing on two-way four-lane and two-way six-lane roads through Vissim, and give a recommended timing plan based on relevant theories. Only by adding pedestrian crossing traffic lights reasonably and adopting scientific signal control methods can the safety of pedestrians crossing the street be guaranteed without reducing or even improving the traffic capacity of the road. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of a recommended timing method for a two-way four-lane signal light according to the present invention;

[0022] Figure 2 A schematic diagram of a recommended timing method for a two-way six-lane signal light according to the present invention;

[0023] Figure 3 When the one-way traffic volume of a two-way four-lane road is 1000 vehicles / h, the average delay before and after the signal light changes with the flow of people;

[0024] Figure 4 This is a graph showing the change in the necessity of lights with the flow of people when the one-way traffic volume is 1000 vehicles / h on a two-way four-lane road;

[0025] Figure 5 This is a schematic diagram of pedestrians and vehicles crossing the street together under the rule of "vehicles give way to pedestrians" when there are no traffic lights;

[0026] Figure 6 This is a schematic diagram of a traffic light in which pedestrians and vehicles cross the street in their respective traffic phases while the other party waits behind the stop line. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1

[0030] A method for controlling pedestrian crossing on a road section with serious conflicts between pedestrians and vehicles comprises the following steps:

[0031] S1: Calculate the headway distance at different design vehicle speeds based on road design specifications and different pedestrian walking speeds;

[0032] If the headway is greater than 4.4 seconds, the formula Vh t =3.6h d .Calculate the requirements for headway under different design speeds. If pedestrians are required to cross the street freely, some pedestrians can only wait before finding a suitable opportunity to cross the street. If the waiting time exceeds the threshold, they may choose to cross the street at risk, causing safety hazards. At this time, you should consider installing traffic lights to assist pedestrians in crossing the street.

[0033] S2: Calculate the ratio based on the average delay time of traffic flow before and after setting the traffic lights, which is defined as the necessity of setting the lights;

[0034] When the necessity of setting up traffic lights exceeds 1, it means that the average delay of traffic flow after the lights are set up is lower than before the lights are set up. In this case, setting up traffic lights to control traffic and pedestrians on the road section can not only improve the safety of pedestrians crossing the street, but also reduce the average delay, improve traffic efficiency and road capacity. It is possible to consider setting up traffic lights to alleviate conflicts.

[0035] When the necessity of setting up lights exceeds 1, you can consider setting up traffic lights to control the traffic flow and pedestrians crossing the road section. The timing of the signal lights must take into account the waiting time threshold of pedestrians crossing the street, the walking speed of the elderly, and the characteristics of accelerating the crossing. In addition, the vehicle traffic efficiency must be improved as much as possible while ensuring the safety of pedestrians.

[0036] (1) According to relevant psychological research, the waiting time threshold for pedestrians is about 50 seconds. After waiting for more than 50 seconds, some pedestrians will become impatient and choose to rush to cross the street during the vehicle passing phase. Drivers are less vigilant during their own passing phase. The combined effect of the two can easily lead to danger. Therefore, the waiting time for pedestrians in each phase should not exceed 50 seconds.

[0037] (2) Among all types of pedestrians, the elderly have the slowest walking speed, about 0.8 m / s. The green light time for pedestrian traffic should be sufficient for the elderly to pass through the corresponding four or six lanes at one time.

[0038] (3) When pedestrians are unable to cross the street during their own phase, they will choose to speed up to complete the crossing in order to avoid conflict with traffic. Therefore, it is necessary to set the yellow light time to ensure that such pedestrians have enough time to complete the crossing.

[0039] S3: Simulate different traffic volume conditions through the simulation system, and then output the average delay of vehicles before and after the lights are set for comparison;

[0040] The simulation system uses the Vissim simulation system to calculate the two-way four-lane road section and the two-way six-lane road section. The one-way traffic volume is 1000 to 2000 vehicles / h. Under different numbers of lanes and traffic volumes, it is assumed that the compliance rate of pedestrians and vehicles to the control is 100%. When the pedestrian flow exceeds the following values, the necessity of setting a light is greater than 1. In some cases, the necessity may even exceed 1.8. For example, in a two-way four-lane road, when the one-way traffic volume is 1600 and the pedestrian flow is 600, the average delay before the light is set is 16.83s / vehicle, and the average delay after the light is set is 9.22s / vehicle, and the necessity of the light is about 1.83.

[0041] S4: Design a method for pedestrian crossing control based on the simulation results.

[0042] In addition, for tidal sections that meet the conditions for setting up traffic lights, the differences in traffic demand changes in different time periods should be taken into consideration, and this control measure should be implemented in specific time periods, starting with implementation during peak hours and resuming during off-peak hours to maximize traffic benefits.

[0043] Example 2

[0044] As the best embodiment of the present invention, the pedestrian crossing control strategy and implementation conditions provided in this embodiment are specifically described as follows.

[0045] On roads with heavy pedestrian traffic but where it is not possible to set up pedestrian overpasses or tunnels due to geological or economic conditions, conflicts often arise between pedestrians crossing the street and passing vehicles. Under the requirement of "cars give way to pedestrians", the passage of vehicles on the road section is often affected by pedestrians crossing the street, and pedestrians crossing the street may also be in danger. In this case, consider setting up a dedicated pedestrian crossing signal to control the vehicle flow and pedestrians crossing the street on this road section.

[0046] Setting up traffic lights can effectively ensure the safety of pedestrians crossing the street. Therefore, if setting up traffic lights can also improve the traffic efficiency and road capacity, then this solution can be considered to alleviate the conflict between pedestrians and vehicles. Therefore, the definition of "necessity of setting up traffic lights" is introduced here to reflect the effect of setting up traffic lights on improving the traffic capacity of road traffic. Its value is the average delay of traffic before and after setting up traffic lights.

[0047] It should be noted that the embodiment selects road sections where pedestrian-vehicle conflicts are more serious as research sections, including but not limited to road intersections in commercial areas, or crosswalks near places with large pedestrian and vehicle traffic at large attractions with a large number of people on both sides of the road; the pedestrian-vehicle conflict is defined as the proximity of pedestrians and motor vehicles in time and space. If neither party takes any risk avoidance behavior, an accident will occur; that is, one or both parties must take avoidance measures to avoid the occurrence of a collision.

[0048] The relevant road design specifications are shown in Table 1. The width of a motor vehicle lane is mostly 3.5 meters or 3.75 meters. In order to calculate whether pedestrians can successfully pass through this lane between the intervals of vehicles, the pedestrian's walking speed needs to be considered; the normal walking speed of young people is about 1.5m / s, but with the increase of age, the step frequency and stride length also decrease. According to relevant surveys, the walking speed of the elderly is about 0.8m / s; in a 3.5-meter lane, in order to ensure the safety of the elderly when crossing the street, the headway between the two vehicles needs to be greater than 4.4 seconds to ensure that the elderly can safely pass through the gap between vehicles.

[0049] Table 1 Design speed and lane width of highways of different levels

[0050] Project Level Design speed (km / h) Lane width (m) Level 1 60-80 3.75 Level 2 40-60 3.5 Level 3 30-40 3.5 Level 4 Less than 30 km 3.5

[0051] If the headway distance is greater than 4.4 seconds, the formula Vh t =3.6h d , calculate the requirements for the headway under different design vehicle speeds; in this embodiment, on a road with a design speed of 30km / h, the design traffic volume of each lane is about 1500 vehicles / h. A 30km section of this road is intercepted at a certain moment. In theory, there will be 1500 vehicles in this 30km section. It can be calculated that the average headway is 20m. A vehicle with a speed of 30km / h theoretically only needs 2.4s to pass through a 20m road, which is far lower than the required 4.4 seconds. Therefore, under this condition, if pedestrians are required to cross the street freely, some pedestrians can only wait before they can find a suitable opportunity to cross the street. If the waiting time exceeds the threshold, they may choose to cross the street at risk, causing safety hazards. At this time, it should be considered to install traffic lights to assist pedestrians in crossing the street.

[0052] When considering pedestrian crossing on a road with more than two lanes in both directions, we cannot simply consider whether the headway time on one lane can meet the pedestrian crossing time requirements. Instead, we should consider whether the traffic conditions on multiple lanes can allow pedestrians to pass through the road smoothly and quickly within a certain period of time. However, since the road traffic conditions cannot be described separately through exhaustive enumeration, we can only use the Vissim simulation software to simulate the road section before and after the lights are installed to compare the relevant indicators before and after the lights are installed.

[0053] According to relevant research, the waiting time threshold for pedestrians is about 50 seconds. After waiting time exceeds 50 seconds, most pedestrians crossing the street will become impatient. Pedestrians with impulsive personalities may choose to cross the street at an inappropriate time, which may easily lead to danger.

[0054] The green light time for pedestrians must meet the time required for all pedestrians to cross the street, that is, the green light time for pedestrians should be sufficient for the elderly to pass through the corresponding four lanes or six lanes.

[0055] Pedestrians who have not completed crossing the street during the pedestrian phase should be given way by traffic.

[0056] According to the above requirements, this embodiment recommends the phase timing of two-way four-lane as follows: Figure 1 As shown, this embodiment recommends the phase timing of two-way six-lane as follows Figure 2 shown.

[0057] Comparing the average delay of traffic before and after adding traffic lights, this ratio can reflect the impact of adding traffic lights on the smoothness of traffic flow. Obviously, under the condition of constant traffic flow, the increase in passenger flow will increase the importance of adding traffic lights to control the road section. As the passenger flow increases, the ratio of average traffic delay before and after the lights will increase, and the importance of setting traffic lights to control street crossings gradually becomes prominent. The larger this ratio is, the more significant the improvement of traffic flow by setting traffic lights, and the more necessary it is to set up traffic lights to control the road section. Therefore, this ratio is named the necessity of setting lights. The necessity of setting lights exceeds 1, which means that the average delay of traffic flow after setting lights is lower than before setting lights. In this case, setting traffic lights to control traffic and pedestrians on the road section can not only improve pedestrian safety, but also reduce average delays and improve traffic efficiency. The necessity of setting lights does not reach 1, which means that setting traffic lights to control traffic and pedestrians on the road section under the current traffic volume is likely to reduce traffic efficiency, which needs to be considered carefully.

[0058] Use Vissim to simulate different traffic volume conditions, and then output the average delay of vehicles before and after the lights are set for comparison.

[0059] like Figure 3 As shown in the figure, for a two-way four-lane road section with a one-way traffic flow of 1000 vehicles / h, the average delays before and after the installation of traffic lights are different for different passenger flows.

[0060] like Figure 4 As shown in the figure, for a two-way four-lane road section with a one-way traffic volume of 1000 vehicles / h, the necessity of installing lights before and after the installation of lights is analyzed under different passenger flow rates.

[0061] According to the simulation results of a two-way four-lane road section with a one-way traffic flow of 1000 / h, when the flow rate is 600 people / h or less, the use of traffic lights to assist pedestrians in crossing the street not only does not improve the road's traffic capacity, but increases the average delay of traffic. When the flow rate rises to more than 700 / h, the use of traffic lights to assist pedestrians in crossing the street effectively reduces delays and increases traffic speed. In this case, it is possible to consider using traffic lights to assist pedestrians in crossing the street to improve the road's traffic capacity and pedestrian safety.

[0062] Using the same method, we can find that under different numbers of lanes and different traffic volumes, when the number of pedestrians crossing the street exceeds the following values, the necessity of installing lights will be greater than 1.

[0063] On a two-way four-lane road section, when the one-way traffic volume is 1,000 vehicles / h and the number of pedestrians crossing the street exceeds 700 people / h, the necessity of installing a traffic light is greater than 1.

[0064] On a two-way four-lane road section, when the one-way traffic volume is 1,200 vehicles / h and the number of pedestrians crossing the street exceeds 600 people / h, the necessity of installing a traffic light is greater than 1.

[0065] On a two-way four-lane road section, when the one-way traffic volume is 1,400 vehicles / h and the number of pedestrians crossing the street exceeds 500 people / h, the necessity of installing a traffic light is greater than 1.

[0066] For a two-way four-lane road section, when the one-way traffic volume is 1,600 vehicles / h and the number of pedestrians crossing the street is about 500 people / h, the necessity of installing a traffic light fluctuates within a small range of around 1.

[0067] On a two-way four-lane road section, when the one-way traffic volume is 1,800 vehicles / h and the number of pedestrians crossing the street exceeds 400 people / h, the necessity of installing a traffic light is greater than 1.

[0068] For a two-way six-lane road section, when the one-way traffic volume is 1,000 vehicles / h and the number of pedestrians crossing the street exceeds 1,000 people / h, the necessity of installing a traffic light is greater than 1.

[0069] For a two-way six-lane road section, when the one-way traffic volume is 1,300 vehicles / h and the number of pedestrians crossing the street exceeds 900 people / h, the necessity of installing a traffic light is greater than 1.

[0070] For a two-way six-lane road section, when the one-way traffic volume is 1,600 vehicles / h and the number of pedestrians crossing the street exceeds 800 people / h, the necessity of installing a traffic light is greater than 1.

[0071] For a two-way six-lane road section, when the one-way traffic volume is 1,900 vehicles / h and the number of pedestrians crossing the street exceeds 700 people / h, the necessity of installing a traffic light is greater than 1.

[0072] like Figure 5 As shown in the figure, when there are no lights, pedestrians and vehicles cross the street together under the rule of "vehicles give way to pedestrians"; Figure 6 As shown, when the traffic lights are set, pedestrians and vehicles cross the street in their own traffic phases, while the other party waits behind the stop line.

[0073] Based on theoretical derivation and related definitions, investigators should investigate the following data to analyze the magnitude of human-vehicle conflicts.

[0074] ① Vehicle speed

[0075] The speed of traffic on a road section greatly affects the size of the conflict between pedestrians and vehicles. When the speed is faster, the reaction time of both parties is shorter. If a vehicle obeys the rule of "giving way to pedestrians" and gives way to pedestrians, then the vehicle needs a greater deceleration to achieve the purpose of avoidance.

[0076] ②Number of lanes

[0077] As the number of lanes increases, drivers and pedestrians will have a greater chance of longer reaction and deceleration time. Vehicles traveling in the inner lane will have more time to avoid pedestrians in front, and pedestrians will have more time to judge the situation and choose the right time to cross the street.

[0078] ③Traffic flow

[0079] The volume of traffic and the speed of vehicles will determine the headway, which will have a significant impact on the chances of pedestrians crossing the street. As the volume of traffic increases, the average headway decreases, which will reduce the chances of pedestrians crossing the street within a certain period of time. If the leading vehicle chooses to give way, more vehicles will be affected and slow down, increasing the overall delay.

[0080] ④ Traffic volume

[0081] The flow of people who need to cross the street also affects the size of the conflict between people and vehicles. As the flow of people increases, the probability of pedestrians crossing the street on the road section also increases. A large number of pedestrians crossing the street will inevitably affect the passage of vehicles. Too many pedestrians on roads without traffic lights will even force vehicles to stop and wait for a long time.

[0082] However, on roads with serious conflicts between pedestrians and vehicles, it is often difficult for the vehicle speed to reach the driver's expected speed. The actual vehicle speed is largely affected by the number of lanes, vehicle flow, and pedestrian flow. Therefore, when conducting an actual survey of the target road section, we can focus on the investigation of the pedestrian and vehicle flow, and then use the survey data to test the impact of the lights on the traffic flow of the road section. Finally, we can decide whether to set up traffic lights to control the road section based on the actual situation.

[0083] On roads where conflicts between pedestrians and vehicles are serious, using traffic lights to control pedestrians and traffic flow is an effective method. Under certain circumstances, the presence of traffic lights can greatly improve the traffic capacity of the road section, not only providing protection for pedestrians crossing the street, but also improving the traffic efficiency of traffic and the driving experience of drivers.

[0084] In addition, whether to add traffic lights on specific sidewalks to control pedestrian crossings requires multiple surveys on this road section. Since the flow of people and vehicles may change greatly depending on the weekdays and holidays and the time of day, the control of traffic lights or the free crossing of people and vehicles should also be carried out at different times. With the arrival of peak hours, the conflict between traffic and people increases. At this time, traffic lights should be used to control pedestrians and traffic. With the end of the peak period, the conflict tends to ease. At this time, if traffic lights are used to control pedestrians and traffic, it is obviously unreasonable, because the conflict between traffic and people is not as serious as before. Traffic light control will only reduce the road capacity and increase vehicle delays. Therefore, when planning whether to install traffic lights on a road section, comprehensive considerations should be made from multiple aspects, multiple surveys and records of human and vehicle traffic, inquiries on the causes and numbers of previous accidents, analysis of economic benefits, and weighing of pros and cons. Only then can a final decision be made.

[0085] Finally, the traffic lights at pedestrian crossings can be coordinated with the signal controls at nearby intersections to meet the safety needs of pedestrians crossing the street while allowing traffic to obtain the green wave traffic effect; after investigating the basic conditions of the road section and its front and rear intersections, the shared cycle, timing and green-to-signal ratio can be determined, and then a coordinated control plan can be determined. This not only improves road safety and smoothness, but also brings important social benefits.

[0086] The present invention is described in detail above through the embodiments, but the contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for controlling pedestrian crossing on a road section with serious conflicts between pedestrians and vehicles, characterized by: The method comprises the following steps: S1: Calculate the headway distance at different design vehicle speeds based on road design specifications and different pedestrian walking speeds; S2: Calculate the ratio based on the average delay time of traffic flow before and after setting the traffic lights, which is defined as the necessity of setting the lights; S3: Simulate different traffic volume conditions through the simulation system, and then output the average delay of vehicles before and after the lights are set for comparison; S4: Design a method for pedestrian crossing control based on the simulation results.

2. A method for controlling pedestrian crossings on roads with serious conflicts between pedestrians and vehicles according to claim 1, characterized in that: In S1, the passing condition headway is greater than 4.4 seconds, which can be calculated according to the formula Vh t =3.6h d .Calculate the requirements for headway under different design speeds. If pedestrians are required to cross the street freely, some pedestrians can only wait before finding a suitable opportunity to cross the street. If the waiting time exceeds the threshold, they may choose to cross the street at risk, causing safety hazards. At this time, you should consider installing traffic lights to assist pedestrians in crossing the street.

3. A method for controlling pedestrian crossings on a road section with serious conflicts between pedestrians and vehicles according to claim 1, characterized in that: In S2, when the necessity of setting lights exceeds 1, it means that the average delay of traffic after the lights are set is lower than before the lights are set. In this case, setting traffic lights to control the traffic and pedestrians on the road section can not only improve the safety of pedestrians crossing the street, but also reduce the average delay, improve traffic efficiency and road capacity, and consider setting traffic lights to alleviate conflicts.

4. A method for controlling pedestrian crossings on roads with serious conflicts between pedestrians and vehicles according to claim 3, characterized in that: When the necessity of setting up lights exceeds 1, you can consider setting up traffic lights to control the traffic flow and pedestrians crossing the road section. The timing of the signal lights must take into account the waiting time threshold of pedestrians crossing the street, the walking speed of the elderly, and the characteristics of accelerating the crossing. In addition, the vehicle traffic efficiency must be improved as much as possible while ensuring the safety of pedestrians.

5. The method for controlling pedestrian crossing on a road section with serious conflicts between pedestrians and vehicles according to claim 1, characterized in that: In S3, the simulation system uses the vissim simulation system to calculate the two-way four-lane road section and the two-way six-lane road section, and the one-way traffic volume is 1000-2000 vehicles / h.

6. A method for controlling pedestrian crossings on roads with serious conflicts between pedestrians and vehicles according to claim 5, characterized in that: Under different numbers of lanes and traffic volumes, assuming that the compliance rates of pedestrians and vehicles to control are both 100%, the necessity of installing a traffic light is greater than 1 when the pedestrian flow exceeds the following values. In some cases, the necessity may even exceed 1.

8. For example, in a two-way four-lane road with a one-way traffic volume of 1,600 and a pedestrian flow of 600, the average delay before installing the traffic light is 16.83s / vehicle, while the average delay after installing the traffic light is 9.22s / vehicle, and the necessity of installing the traffic light is approximately 1.

83.

7. A method for controlling pedestrian crossing on a road section with serious conflicts between pedestrians and vehicles according to any one of claims 1 to 6, characterized in that: For tidal sections that meet the conditions for setting up traffic lights, the differences in traffic demand changes in different time periods should be taken into consideration, and this control measure should be implemented in specific time periods, starting with implementation during peak hours and resuming implementation during off-peak hours to maximize traffic benefits.

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