The Study On Traffic Flow Characteristics And Traffic Control Strategy Of Ring Expressway

At present,the road management mode of the Ring Expressway can not meet the development level of the expressway,so it is very important to realize the effective management and control of the urban expressway traffic flow.To realize the effective management,control and induction of urban expressway traffic flow,it is necessary to make a comprehensive estimate of the traffic status of the city highway to evaluate the traffic situation around the city highway.The traffic condition estimation of the expressway is a nonlinear estimation problem based on the traffic condition parameter estimation.The main contents of this paper include the following aspects:(1)Analyzed the characteristics,function types,traffic composition and similarities and differences of the city expressway and expressway,and discussed the relationship between the expressway and the transit traffic.Analysis and Treatment of Monitoring Data of Characteristic Parameters of 700 Traffic Flows in Four Seasons of Urban Expressway.(2)The gray clustering algorithm is used to divide the 700 sets of data,and the three states(smooth,crowded and mild crowded)of the expressway are determined,and the second-order macroscopic traffic flow model is combined with the particle filter algorithm and the improvement Algorithm(based on the ant colony algorithm of particle filter algorithm)to build a traffic state parameter estimation model,the indirect realization of the purpose of traffic state division.(3)Three-mode cooperative control model of Ring Expressway is established,and genetic algorithm is used to solve each model.(4)Taking Xi’an Ring Expressway as an example to analyze.The test data of Xi’an Ring Expressway are applied to two traffic state parameter estimation models,and the traffic state is divided and the experimental results are compared and analyzed.The experimental results show that the double-strategy cooperation of the Ring Expressway Ramp and the main line control method can greatly reduce the vehicle in the Ring Expressway on the total travel time and delay,to reduce the traffic on the Expressway on the traffic density,The traffic congestion in urban roads has a good effect.