Research On Multi-stage Route Guidance Method Considering Green Wave Of Trunk Line

Reasonable traffic signal control and vehicle route guidance are important methods of alleviating the traffic congestion.There exits mutual relationship among timing plan of the traffic signal control and vehicle route guidance plan.How to comprehensively consider traffic signal control and vehicle route guidance has been research hotspots in the field of intelligent transportation at home and abroad.In the traffic control of large urban road network,due to green wave of trunk line control has good reliability and strong practicability,green wave of trunk line control has been a widely used traffic signal control method.And in the process of route guidance,due to continuity of traffic flow in the green wave bandwidth of trunk line,select partial route of trunk line maybe shorten the overall travel time of vehicles.According to this,firstly this paper aims at the problem of improving the efficiency of green wave of trunk line coordinated control and studies the coordinated control method of green wave in trunk line considering the variable speed of different road sections.Further,based on the analysis of the impact of the green wave on the vehicle travel time and the route induced flow on the coordination and optimization of the green wave of trunk line.This paper studies the collaborative optimization method of green wave of trunk line and multi-stage route guidance,and realizes the improvement of traffic network efficiency.The specific research work of this paper is as follows:1.This paper establishes a collaborative optimization model of speed guidance and signal control of the trunk line.Based on the basic model of bidirectional green wave bandwidth,firstly this paper analyzes the constraint relationship between the guided green wave velocity and the flow in each section of the trunk line.Further,the green wave velocity is taken as one of the optimization parameters.This paper considers the influence of different weight of green wave speed.The objective is to maximize the comprehensive bandwidth of bidirectional green wave of trunk line.The combination optimization model of green wave velocity and phase difference is constructed.And particle swarm optimization algorithm is used to optimize the model.Finally,this paper uses VISSIM software to build the trunk line simulation model.And simulation analysis is carried out based on the solution results.The validity of the model is verified in this paper.2.A collaborative optimization model of green wave of trunk line and multi-stage route guidance is established.Firstly,on the basis of the collaborative optimization calculation results of speed guidance and signal control of trunk line,this paper presents a method for calculating the travel time of green wave coordinated path of trunk line.Further,the link travel time is taken as the link weight.And Dijkstra algorithm is used to solve the optimal path.Then,this paper considers the interaction between route guidance and signal control.A bi level programming model for collaborative optimization of green wave of trunk line and multi-stage route guidance is established.And the improved Dijkstra algorithm is used to solve the model.Finally,VISSIM software is used to build a road network simulation model and verifies the effectiveness of the proposed method.Lastly,this paper makes a summary and the future work is prospected.