Research On The Coordinated Optimization Of Urban Network-wide Traffic Signal

Urban transportation issue is considered to be the lifeblood of steady social and economic development.Improving the traffic conditions and the negative impact on the environment is also an indispensable step in the struggle of "Two Centenary".Most cities in China are plagued by traffic congestion.Only by solving that can motivate the economic potential of cities.In alleviating urban traffic congestion,introducing advanced intelligent traffic control technology to coordinate and optimize regional traffic signals to improve the carrying capacity of the urban road network is the most economical,convenient and effective means.This article mainly studies the coordination and optimization of traffic signals in urban road areas.The research is divided into three parts: the research of single intersection signal timing,the research of sub-zone division method and the research of stop and optimization method of timing plan.The main contents of this article are as follows:1.Aiming at the traffic signal control problem of single intersection in urban traffic peak period,a signal timing method of single intersection based on multi-objective genetic particle swarm algorithm is proposed.In the research,genetic algorithm is used to improve the classical particle swarm algorithm,increase the diversity of its particle population,and improve its optimization ability.Then select an actual intersection under saturation for case analysis,use the improved GA-PSO algorithm to optimize the multi-objective optimization method,and obtain a new timing plan.2.Aiming at the problem of dividing control sub-areas,a method of dividing control subareas based on the correlation degree of multiple intersections is proposed.By analyzing the distance between adjacent intersections,the traffic volume of the road section,and the signal timing parameters of the intersections,the correlation of adjacent intersections Influencing effect,an intersection correlation degree is proposed to quantitatively describe the strength of the correlation between adjacent intersections.Next,the constraints and evaluation indexes of the sub-zone division are set,and the optimal control sub-zone division plan is obtained.3.Aiming at the problem of signal coordination and optimization in the control sub-zone,a regional traffic signal coordination and optimization method based on stop and delay is proposed.By establishing the correlation between the vehicle delay time,the number of stops and the signal timing parameters,the optimal signal coordination and timing plan is sought to achieve the minimum weighted sum of the total number of stops and delay time in the control area.