Traffic Modeling And Simulation Based On Cellular Automata

Traffic modeling and simulation is a kind of road traffic model,by building on the road to the state of vehicle,congested and traffic light control management,so as to improve road management means a kind of complex simulation technology.The difference between the model and the simulation method is established,and the accuracy and application value of the simulation results are influenced.In this paper,based on the cellular automata model,in view of the traffic flow is relatively small and the speed is not particularly fast lane,establish a one-dimensional cellular automata model of traffic flow(Nagel-Schreckenberg model),analysis of vehicles into probability and vehicles off the probability at the junction of road traffic flow,the effect of vehicle density and the average vehicle speed;Based on the situation a two-lane,considering two lane a vehicle lane changing impact on traffic flow,analysis on two-lane traffic condition,the comprehensive comparison of single and double lane traffic flow characteristics,contact road,the road network signal control,to find the ways to solve and reduce road congestion.The research can be used to guide the actual urban traffic management and optimization problem,improve the city's traffic service level,and solve the problem of combining theory with practice.In a single model based on cellular automata,this article obtains from the NS model of single and double lane,analysis about the critical condition of the different road traffic capacity,the influence of vehicles to enter the intersection average arrival rate and the rate of the vehicle from out of the intersection,respectively,that the relationship with vehicle traffic capacity.At the entrance road,according to different values of average vehicle arrival rate,the NS model of single section average density,average speed of vehicles,the average traffic simulation analyzed respectively,from the simulation results obtained the average arrival rate changes on the section average density,average speed of vehicles,the average traffic impact.In sections of the exit,in view of the vehicle out of the different values of probability,the same to the NS model of single section average density,vehicle average speed simulated respectively,from the simulation results and the average vehicle on the road out of probability density,the influence of average vehicle speed.In view of the single NS simulation results of the model,the simulation results show that the vehicles average arrival rate at the entrance and exit vehicles out of probability of the vehicles in the lane features is a key influence,is similar to the above model of governance problem of road traffic capacity has great research significance.In two-lane model based on cellular automata,two-lane simulation optimization design and intersection,also got into the intersection of the vehicle respectively the average arrival rate and the rate of the vehicles from out of the intersection of the density of road traffic,vehicle average speed,the specific influence on average traffic flow.Results Can be found from the simulation experiments,the double driveway,due to the emergence of vehicle flow,allowing more vehicles to enter the road,the traffic density increases,while the average speed of vehicles than one lane is reduced,but the overall traffic increased.Finally,this paper respectively for single intersection signal control and intersection signal coordination control was analyzed,according to the above two situations respectively adopted optimization design,put forward green letter than optimization and green wave band control intersection signal control methods,such as,to save energy consumption,reduce environmental pollution at the same time,improve the road traffic,for wisdom and peace city construction,from the development strategy of urban transportation planning,development of advanced traffic management and control technology has provided the reference opinions and research value.