Research About Bus Priority Based On Vehicle Infrastructure Cooperative Technology

In recent years,with the gradual maturity of vehicle-road collaborative technology,many researchers in transportation have applied it to solve the traffic difficulties.The research on bus priority method based on vehicle-road collaboration has also become a new solution for traffic congestion in major cities.The traditional bus priority signal control method has some shortcomings due to the limitation of hardware and software conditions,such as not real-time,not intelligent and so on.Vehicle-road cooperative system can provide more multi-source,accurate and real-time data for bus priority signal control.It can scientifically dilute the contradiction between buses and social vehicles,effectively guide vehicles and reasonably control signals,and provide a good environmental basis for bus priority.In this paper,under the environment of vehicleroad coordination,the bus priority method is studied as follows :(1)The basic data acquisition methods under the vehicle-road collaborative system are analyzed,and the vehicle-road collaborative methods are compared.Different from the traditional means of bus priority and the technical support of vehicle-road collaborative technology for bus priority,the calculation method of the queue length of key parameters and the number of real-time passengers on buses and the strategy of speed guidance under vehicle-road collaborative environment are proposed.(2)This paper proposes a method of bus priority signal control in the vehicle road collaborative environment.According to the per capita delay,bus punctuality rate and traffic efficiency,the effect of bus priority is evaluated,and the benefit function is formed to measure the actual benefit of bus priority.Through the analysis of the whole delay of bus,the optimization model of bus delay is established.The objective function is to minimize the delay by considering the per capita delay in the intersection and the passenger delay waiting at the downstream station.The improved method of dragonfly algorithm is proposed.According to the dragonfly optimization algorithm,the model is solved,and the solution with the maximum benefit function is obtained as the bus priority signal control method to control the bus priority traffic.(3)According to the VISSIM simulation software,through the secondary development of python,simulate the actual vehicle road collaborative environment,and realize the bus priority signal control method and model solving algorithm proposed in this paper.Take Beijing 320 bus line as the simulation example to verify the simulation.Through the comparison and analysis of the evaluation indexes of the simulation results,it can be shown that the bus priority method based on vehicle-road collaboration proposed in this paper can ensure the bus priority right and improve the actual benefits of the intersection.