Research On Bidirectional Green Wave Coordination Control And Simulation Of Urban Main Road

With the rapid development of cities,the growth rate of private car ownership has gradually exceeded the normal supply capacity of urban transport infrastructure.The continuous growth of traffic demand and the lack of space-time resources of traffic have serious mismatches,resulting in the normalization of urban traffic congestion.With the upsurge of national urban traffic intellectualization,under the condition of limited growth rate of existing transport infrastructure,using scientific means of traffic management and traffic control to improve the overall efficiency of urban traffic has become a key means.As an important part of the urban traffic system,trunk traffic coordinated signal control scheme adapted to the current traffic situation is designed by scientific and reasonable methods.Improving the efficiency of trunk traffic is very important for the overall development of urban traffic.Firstly,this paper briefly introduces the related knowledge of trunk line coordination.Then,aiming at the traditional calculation methods of common period,green signal ratio and phase difference of three important parameters in trunk line coordination system,after learning and practical verification,the improved calculation ideas and methods are put forward.Secondly,by learning the traditional two-way green wave coordinated control optimization model,aiming at its deficiencies in single-point signal phase sequence,using the American Electrical Manufacturing Association's double-loop and double-section signal control method,according to the relationship of green light start-up time in the coordinated direction of the trunk line,using the diversity of signal phase overlap or discontinuous part values,the green light start-up time at each intersection of the trunk line is established.The relationship between the model and the length of green light,and classified and summarized according to field investigation and practice,completed the establishment of the two-way green wave bandwidth maximization model of trunk lines.Finally,taking the trunk line system composed of six consecutive intersections of Youai Central Street in Yinchuan City as an example,a green wave signal control scheme is designed based on the green wave model.Vissim micro-simulation platform is used to restore the actual traffic condition of Youai Street,and the signal timing schemes of Youai Central Street before and after optimization are simulated respectively.Finally,the traffic evaluation parameters such as parking times,delay time and queue length are analyzed and compared,which verifies the correctness and practicability of the green wave model and design scheme.