Research On Control Strategy Of Bus Priority Signal At Intersection Based On Real Time Information

With the acceleration of urbanization in China,the problem of traffic congestion is becoming more and more serious.Giving priority to the development of public transportation is one of the important means to alleviate the problem of urban traffic congestion.At present,there are two kinds of bus priority methods commonly used.One is the space-based bus priority method,such as the establishment of bus lanes,which is often limited by road space resources.The other is time-based bus priority,such as bus priority by adjusting the timing of intersection signals,which has a wide range of applicability.With the development of information technology and traffic detection technology in recent years,not only real-time traffic flow information can be obtained,but also accurate bus location and travel time information can be obtained.Comprehensive use of these information is conducive to improve the control effect of bus signal priority.Therefore,based on the real-time vehicle information obtained by traffic detection technology and combined with the prediction method of bus travel time,this paper studies the signal priority control strategy under different arrival conditions of buses at intersections.Firstly,the basic theory of intersection signal control,the basic method of bus priority,and the working principle of traffic information detection technology are introduced.The related factors affecting bus travel time are analyzed,and a prediction model of bus travel time based on genetic algorithm optimized wavelet neural network is established,which is verified by case analysis.The prediction model can provide more accurate travel time data for the subsequent priority control of bus signals.Then,in view of the situation that a single bus arrives at a single intersection,on the premise of assuming the intersection traffic conditions and signal timing,the objective function of single bus signal priority control based on the intersection traffic efficiency index is established,the signal priority control parameters are calculated,and the single bus signal priority control process is designed.The simulation analysis is carried out through VISSIM,and the results show that the proposed single bus signal priority control method can not only reduce the bus delay,but also improve the traffic efficiency of the intersection.Finally,in view of the multiple bus,arrived at a single point of intersection is analyzed under the single phase and multiphase bus priority application and the mechanism of conflict types,establishes intersection traffic benefit maximization as the goal of many bus signal priority control model,calculated the control model of related parameters,design the bus signal priority control process,The dynamic programming algorithm is used to solve the model.The simulation analysis is carried out through VISSIM,and the results show that the proposed multi-bus priority application conflict control method can reduce bus delay and improve vehicle traffic efficiency at the intersection under different priority application conflict situations and lane saturation.