Research On Multi-Phase Bus Priority Scene Based On V2X Technology

Public transportation has the advantages of large passenger volume,high efficiency,environmental protection and safety.Priority development of public transportation is generally considered to be one of the effective means to relieve traffic congestion and improve traffic efficiency.In many cities,the priority traffic strategy is adopted to improve the traffic efficiency.The early control strategies are mainly based on RFID(Radio Frequency Identification Technology)and BRT(Bus Rapid Transit System),both of which have low level of intelligence and low utilization of social public resources,unable to cope with complex road conditions and other problems.It is impossible to accurately predict the passing time of buses,resulting in poor control effect of the single-phase bus priority control method,and it is easy to cause congestion in other non-priority phases due to bus priority,and there are few studies on multi-phase bus priority scenarios.In view of the above problems,this paper applies the V2X(vehicle to everything)technology in the bus priority scene,endows the signal with the wireless information exchange ability of the vehicle,obtains the road condition information in real time,accurately predicts the arrival time of the vehicle and operates according to the actual phase of the intersection.Make traffic decisions to ensure bus priority with optimal traffic efficiency.The main research work and results are as follows:(1)Completed the construction of the intelligent signal machine hardware platform with V2 X communication capability,and introduced the design and function of each module to provide the hardware foundation for subsequent research.(2)The software design of the entire control system is introduced from the perspectives of roadside equipment and vehicle-mounted equipment,the functions of each module are described in detail,and the calculation of relevant parameters is explained.Finally,the sumo(Simulation of Urban Mobility)simulation and platform construction are introduced,which provides conditions for the realization of the simulation in the following.(3)In the single-phase bus priority scenario,the total delay time at the intersection is used as the evaluation standard for the quality of bus priority,and the two control methods of RFID technology and V2 X technology are used for analysis.Effectively reduce the delay of non-priority phases,determine the advantages of V2 X technology in this application scenario,and build a corresponding simulation environment for verification.At the same time,the relevant traffic terms are introduced.(4)The multi-phase bus priority control scenario is studied,and the delay analysis is carried out for different signal state responses.When there is a conflict between multiple bus priority applications,the minimum per capita delay time is used as the reference index,and the multi-phase bus priority control is realized based on the decision tree algorithm.And it is simulated and verified on the sumo simulation platform.