225 results about "Traffic conflict" patented technology

The invention discloses an air traffic control system for four-dimensional (4D)-trajectory-based operation. The air traffic control system comprises a data communication module, a monitoring data fusion module, an airborne terminal module and a control terminal module, wherein the monitoring data fusion module is used for fusing the monitoring data of an air traffic control radar and automatic dependent monitoring data, and providing real-time trajectory information for the control terminal module; and the control terminal module comprises a preflight conflict-free 4D trajectory generation sub-module, an in-flight short-term 4D trajectory generation sub-module, a real-time flight conflict monitoring and alarming sub-module and a flight conflict resolution 4D trajectory optimization sub-module. The invention also discloses an air traffic control method for the system. The control terminal module processes flight plan data, generates 4D trajectories, analyzes potential traffic conflicts of air traffic conditions and provides an optimal resolution scheme. By the system and the method, flight conflicts can be effectively prevented, and the safety of air traffic can be improved.

The invention discloses a mid-term air traffic conflict detection method based on 4D flight path and radar data, which relates to air traffic control automation. In the method, accurate 4D flight path data and real-time radar data are projected onto a display panel of an air traffic control system, each aircraft pair is filtered according to the accurate 4D flight path data and the real-time radar data, and aircrafts which are unlike to come into conflict with other aircrafts in 30 minutes are determined; and the detection is focused on the aircraft pairs which have potential to run into conflicts, the covariance between the relative speed and relative position of the aircraft pairs is calculated by using coordinate transformation according to the vertical interval and time interval of two aircrafts, and then the probability that a predicted position interval is smaller than a safe interval at time t is calculated and a detection report is made. In the invention, the drawbacks of long-term and short-term conflict detection are overcome, and the long-term conflict detection, mid-term conflict detection and short-term conflict detection are combined to ensure flight safety. The average conflict detection time is about 0.028 seconds, and the method has high real-time performance.

The invention discloses a traffic conflict simulation two-stage parameter calibrating method, which comprises the following steps of: calibrating parameters in traffic simulation software (VISSIM) influencing traffic running at a first stage; and calibrating a simulation conflict decision threshold value in conflict analysis software (SSAM) at a second stage. On the basis of the conventional traffic simulation model parameter calibrating method, the two-stage parameter calibrating method oriented to traffic conflict simulation is provided, so that the defect of low conflict simulation accuracy existing in the conventional parameter calibrating method is overcome; and the method has practical engineering use value on the aspect of safety research of a traffic design scheme by using microscopic simulation software.

The invention belongs to the technical field of autonomous vehicle coordinated operation. The invention, in view of a traffic conflict problem generated when unmanned vehicles pass by an unmanned intersection, specifically discloses a unsignalized intersection vehicle self-collaborative passing method based on position sharing. The method includes the following steps: configuring a vehicle position real-time monitoring system at a unsignalized intersection; enabling an onboard positioning terminal to share approaching vehicle positions and travelling loci in real time by using a satellite and communication network; and calculating, by a cloud computing platform, the travelling loci of vehicles entering a detection area and a conflict with the approaching vehicles in real time according to intersection monitored data, and enabling vehicles at entrance lanes to pass by the intersection without conflicts.

The present application discloses a road traffic control system comprising a video traffic information analysis module configured to obtain traffic condition parameters of a road network from video traffic information, a traffic condition prediction module configured to predict traffic condition in a future time according to the traffic condition parameters and obtain a traffic situation prediction result, an actual traffic condition evaluation module for evaluating actual traffic conditions based on the traffic condition parameters according to a traffic condition evaluation model and obtainan actual traffic condition evaluation result, a traffic control decision module for determining a control scheme for controllable traffic elements via adoption of an optimization algorithm accordingto the traffic condition prediction result and the actual traffic condition evaluation result. Traffic conflicts between motor vehicles and the pedestrians as well as non-motor vehicles at intersections in the road network can be reduced, and therefore traffic congestion at the intersections in the road network can be effectively improved.

The invention relates to a temporary traffic control method used for an environment that part lanes are enclosed. The temporary traffic control method includes the steps of (1) warning prompt, wherein a traffic warning sign that the front lane is narrowed is arranged at the position 300 m or 150 m before a waving section, and a sign that lane changing is prohibited is arranged at the same time, (2) lane management, wherein the sign that the lane changing is prohibited is arranged at the position 100 m before the weaving section to stop vehicles from changing lanes randomly at the weaving section, (3) signal lamp arrangement, wherein signal lamps are arranged 50 m before the weaving section, independent signal lamps are adopted to control all lanes respectively and the group number of the signal lamps is equal to the number of original lanes, (4) signal lamp control, wherein at the same moment, the number of releasing lanes is the same as that of the lanes remaining being used in a working region, and the lane releasing principle is the same as that of conventional signal lamps. By the adoption of the method, the weaving section where occupying-road construction is conducted or the number of the lanes is reduced can be effectively managed and controlled, through efficiency is improved, traffic conflicts are reduced, and the method is easy to implement.

The invention discloses a method of resolving traffic conflicts of two vehicles at a no-signal intersection, mainly solving the problem of collision of two vehicles at an intersection. The method comprises: first, collecting the information of two vehicles, and predetermining whether two vehicles conflict at an intersection according to the time of the two vehicles arriving at the intersection; second, building an analytical hierarchy structure to determine the priority of the conflict vehicles; employing a PID controller to control the time of two vehicles arriving at a conflict area so as to resolve conflicts, and optimizing parameters of the PID controller; and finally building a gaming model to optimize a conflict resolving strategy and to allow the two vehicles to pass through the intersection within shortest time. The method employs the PID controller to control the time of two vehicles arriving at a conflict area so as to resolve conflicts, and optimizes parameters of the PID controller, thereby increasing the efficiency of solving conflicts between two vehicles, and reducing traffic conflicts at an intersection.

The invention discloses an induction type give-way control system for primary and secondary road junctions under poor sight distance conditions. The induction type give-way control system comprises magnetic induction detection coils, a data transmission device, a control system center and crystal diode signs. The magnetic induction detection coils are used for detecting the current speeds, vehicle lengths and moments of vehicles at all entrance lanes. The data transmission device is used for transmitting data to the control system center in a wireless broadcasting mode and sending instructions generated by the control system center to the crystal diode signs. The control system center is used for calculating the time when the vehicles at the primary and secondary road junctions reach the points where conflicts may happen and generating corresponding instructions. The crystal diode signs are used for prompting the vehicles going to enter the road junctions along secondary roads to give way or pass through according to the instructions sent by the control system center. The invention further provides an induction type give-way control method for primary and secondary road junctions under poor sight distance conditions. Induction type give-way signs are arranged at the primary and secondary road junctions, driving behaviors of drivers of vehicles on the secondary roads are helped and induced, traffic conflicts of the vehicles on the primary and secondary road junctions are reduced, and driving safety at no-signaled road junctions is improved.

The invention discloses a traffic organization design and control improvement method of intersection passing capacity and road net traffic content in the traffic design and control domain, which is characterized by the following: adapting main road junction peripherial road net to form a micro-circulation system to finish steering task of each direction; adapting the ways such as í‹stop turning left or rightíŒ, í‹one way runningíŒ and so on to simplify the traffic intersection collision to improve the traffic intersection passing capacity; utilizing í‹green waveíŒ to reduce the parking frequency and driving delay. The program is fit for mutual matching of different grades, which realizes the city traffic harmonious development.

The invention discloses a dynamic cooperative management and control method for variable speed limitation of an automatic driving special lane and a universal lane in a confluence area on an expressway. The method comprises the steps: generating a traffic operation state classifier; establishing a preset function curve of the three objective functions; determining the layout number of automatic driving special lanes; when the traffic operation state is crowded, starting a dynamic cooperative control scheme; enabling a roadside communication unit to issue automatic driving special lane control information and dynamic variable speed limit control information; and enabling a traffic information cloud end to dynamically adjust variable speed limit information, and when the traffic flow tends to be in a stable free flow state, ending dynamic cooperative management and control. According to the dynamic cooperative management and control method for variable speed limitation of the automatic driving special lane and the universal lane in the confluence area on the expressway, the adaptability of CAVs is promoted by providing a priority right to use the automatic driving vehicle, an active management mode is provided for a traffic manager, variable speed limitation is carried out on the traffic flow of the universal lane, and the purposes of improving traffic efficiency and reducing traffic conflicts are achieved.

The invention relates to a road junction traffic conflict detection and safety evaluation method based on two-dimensional laser scanners, which is remarkably characterized by comprising the steps of: acquiring and fusing motion parameters of road junction moving objects by using a plurality of two-dimensional laser scanners; computing conflict parameters and serious degree of traffic conflict occurring among traffic participating units by the motion parameter of each moving object; and constructing an intersection safety state evaluation method based on the traffic conflict on the basis of intersection serious conflict statistic and traffic volume statistic to realize the evaluation and the monitoring of the intersection safety state. The road junction traffic conflict detection and safety evaluation method based on the two-dimensional laser scanners has the characteristics of low cost and accuracy and rapidity, brings convenience to the research of the road junction traffic conflict, is beneficial to implementing the effective improvement on the road junction traffic control, and ensures the traffic safety.

The invention discloses a traffic simulation model calibration method considering traffic conflict index distribution problems. According to the method, an efficiency index and a safety index are considered at the same time, an appropriate intersection efficiency index is selected to serve as a constraint condition of a first-round calculation target and a second-round calculation target of traffic simulation modeling, and an appropriate intersection safety index is selected to serve as the second-round calculation target of traffic simulation modeling; by calculating a standard difference ofsimulation indexes and selecting an appropriate confidence interval to estimate the minimum number of times of simulation needed for an established simulation model, the number of simulation tests ofparameter correction is effectively reduced; an ANOVA test or a correlation test are used to screen out simulation parameters with remarkable influences on the efficiency index and the safety index; amulti-constraint calibration optimization problem is established, and a specific strategy and a process for calibrating model parameters by use of a genetic algorithm are proposed; a fitness parameter selection scheme is proposed; a model constraint condition selection scheme is proposed; and model calculation is performed through traffic conflict parameter distribution.

The invention provides a delay scheduling-based network traffic conflict prevention method and a delay scheduling-based network traffic conflict prevention system. The method includes: step 1: path performance detection is carried out on a default path within a probing cycle, and if the default path of an overlay network can meet the requirement of network transmission performance, step 2 is executed, or else step 3 is executed; step 2: traffic is transmitted via the default path; step 3: a transfer traffic calculation function is utilized to calculate transfer traffic to be transferred on the default path, and the transfer traffic is part of the traffic transmitted on the default path; step 4: path performance detection is carried out on alternate paths, the transfer traffic is allocated onto the alternate paths for transmission according to the carrying capacity of the alternate paths, and the steps are repeated in the next probing cycle. The invention solves the problem of vertical conflict in the prior art, prevents the phenomenon of frequent jitter caused by the optimization conflict problem of the conventional overlay network system, and guarantees the normal service performance of the overlay network.

The invention relates to a design method for improving the traffic of a T-shaped road intersection based on asymmetrical traffic requirements. The design method comprises the following steps: cancelling a pedestrian crosswalk (12) with lower crossing requirements in a trunk road, and setting an oblique crosswalk with a trunk road sidewalk as a starting point and a crossing point of the pedestrian crosswalk (12) and a corner traffic island (1) as a final point; setting a twice-crossing safety island (6) at the center of the road intersection, and setting a safety island divided block (8) on the safety island (6), and setting a safety island guide line around the safety island (6); extending a straight-going vehicle entry lane at the side of the cancelled pedestrian crosswalk (12) as a zigzag stop line (9) and a left-turning waiting zone (10); and setting a left-turning guide line (5) in the road intersection, and setting signal lights at the starting point and the final point of the oblique crosswalk to realize the same phase traffic of pedestrian on the oblique crosswalk and left-turning vehicles on the cross road. With the adoption of the method, the traffic area of the T-shaped intersection is improved, and the traffic conflict is reduced; and the method is applied to T-shaped intersections with large left-turning vehicle flow at the cross roads, asymmetrical requirements for pedestrians to cross the street and lower vehicle speed.

The invention relates to a design method for cooperating the street crossing of opposite-angle pedestrians and the left turning of a motor vehicle at an intersection. According to the method, firstly, traffic island chamfer parts (2) of angle-turning traffic islands (1) in the opposite-angle direction of the intersection are connected with each other, and two zebra crossings (5) with the opposite angles being crossed are arranged so that the opposite-angle pedestrians can pass through; a central pedestrian safety island (7) is arranged in the center of the intersection, and a left turning guide line (6) of the motor vehicle is arranged in the intersection, so as to ensure the separation of motor vehicles and non-motor vehicles at the intersection and guarantee the secondary opposite-angle street crossing safety of the pedestrians; meanwhile, pedestrian street-crossing traffic lights (4) in the opposite-angle direction are arranged on the angle-turning traffic islands (1) at the intersection, so that the street crossing of the opposite-angle pedestrians and the left-turning street crossing of the motor vehicles are controlled together with signal phases cooperatively. According to the design method, the effective road passing-through area of the intersection at a left-turning phase can be effectively enlarged, the delay of the street crossing of the opposite-angle pedestrians can be reduced, and the traffic conflict can be decreased. The design method is suitable for the intersection of an urban road which is large in the flow of the left-turning motor vehicles, large in the demand of opposite-angle street crossing and lower in the speed of the vehicles.

The invention provides an urban intersection safety evaluation method based on an extreme value theory and microscopic simulation. According to the method, operating conditions of intersections in a peak period are collected through videos, recognition and data extraction are performed on an intersection conflict, simulation software VISSIM is adopted to perform traffic network simulation modelingand calibration, a conflict track file is extracted, and conflict data is screened; an extreme value model is adopted to perform modeling on the traffic conflict data, and accident risk rates of theintersections are calculated; specifically, a TCT method and an extreme value theory method (Strategy 3) are used to calculate risk degrees respectively, and a Pearson coefficient and a Spearman Rankcoefficient are compared; according to the Pearson coefficient, association calculation is directly performed on the number of actual accidents and safety risk indicators; and according to the Spearman Rank coefficient, safety ordering is performed on the intersections according to the risk indicators and the number of the actual accidents respectively, and the safety evaluation method most approximate to the safety reflected by the actual accidents is selected.

The invention relates to a cluster intelligent traffic flow control system, belonging to the intelligent traffic field. In the system, a microcomputer device is arranged on a single vehicle, a main control CUP interface of the microcomputer device is connected with a wireless data transmission module and a pre-programming input module, information transfer stations are arranged along a road and at a crossroad, a wireless transceiving device of each information transfer station is connected with a computer, the computer is respectively connected with a center monitor station and an intersection signal lamp device through data lines, the powers of all vehicle wireless transceiving devices are same, and each vehicle wireless transceiving device is additionally provided with a power amplification and activation circuit. The invention can realize information exchange among vehicles so that a plurality of vehicles generate cluster intelligence and information is exchanged among a plurality of clusters to realize negotiation among clusters, therefore, the clusters pass through the crossroad with an optimal scheme, and traffic conflict is avoided. The system has simple structure and feasible scheme.

The invention relates to an intersection traffic conflict discrimination method based on a real-time vehicle track. The method comprises the following steps: 1, collecting real-time video image data,and carrying out image graying, median filtering and binarization preprocessing; 2, establishing a video background model according to a Gaussian mixture background model, and extracting a vehicle target through morphological filtering; 3, according to the centroid coordinates of a minimum external rectangular frame of an extended Kalman filtering method, obtaining the moving track of a vehicle, and tracking a moving target; 4, acquiring intersection traffic flow track speed parameter data; and 5, based on the real-time traffic flow data, creating a traffic conflict discrimination model and aconflict counting method of the vehicle. The invention provides a video-based traffic conflict discrimination and counting method for vehicle moving tracks, traffic conflicts at intersections can be detected in real time and counted, higher efficiency and more accuracy are achieved, and compared with the traffic conflict number obtained by a manual counting method, the accuracy is higher.

The invention discloses a method for testing safety performance of an unsignalized intersection by utilizing equivalent traffic conflict, belonging to the field of managing road traffic. The method comprises the following steps of: firstly determining a generation type of traffic conflict of unsignalized intersection, namely intersection conflict, merging conflict and diverging conflict; and guiding different types of traffic conflict probability distribution and expected traffic conflict severity degree, obtaining practical hour conflict amount of an intersection by utilizing a VEVID (Vehicle Video Capture Data Collector) video processing software, constructing an equivalent traffic conflict amount of the intersection based on the obtained practical hour conflict amount as an index for testing the safety of the unsignalized intersection, and finally obtaining the tested grade of the safety of the unsignalized intersection through statistic analysis. According to the method for testing the safety performance of the unsignalized intersection by utilizing the equivalent traffic conflict, disclosed by the invention, time period of test can be favorably shortened, the efficiency and the precision of the test are improved, the degree of automation is high, no influence of personal factors exists, the reliability of the test is high, a large amount of data samples can be objectively and quickly obtained, and reliable data base is provided for probability statistic analysis.

The invention provides a complexity-based air traffic conflict management method and device. The method comprises the steps that when the situation that an airplane enters a target sector is detected, a calculation chart of the complexity corresponding to the target sector is drawn according to the controlled activity corresponding to the original airplane in the target sector after the entered airplane enters the target sector; the optimal path of the minimum conflict is calculated for the conflict area in the calculation chart of the complexity; and the entry point corresponding to the optimal path is selected to act as the optimal entry point from which the entered airplane enters the target sector. According to the complexity-based air traffic conflict management method and device, the entered airplane is enabled to enter the target sector according to the optimal entry point, the optimal entry point of the entered airplane is found according to the complexity calculation chart, and the entry point of the airplane can be corrected by using the detailed information of the aspect of reaction of the air traffic to the entered airplane provided by the complexity so that the conflict in the sector can be reduced to the greatest extent, the safe interval between the entered airplanes can be ensured and the workload of the sector controller can be reduced to the greatest extent.

The invention discloses a method and equipment for monitoring a traffic conflict caused by a fault vehicle; the method comprises the steps: receiving vehicle data information, including vehicle positioning information, vehicle traveling information and vehicle fault information sent by a fault vehicle; determining that the vehicle fault information belongs to a vehicle fault type capable of inducing traffic accidents according to the vehicle fault information; estimating the possible traffic conflict caused by the fault vehicle according to the vehicle position information and the vehicle traveling information; according to the estimated result, issuing warning information to other vehicles which are in danger caused by the fault vehicle; therefore, traffic accidents caused by the fault vehicle are avoided, the probability of occurrence of the traffic accents is reduced and the safety of road transportation is improved.