Resesarch On Micro Traffic Flow Model And Simulation Of Cellular Antomata Basad On Defesive Driving

With the rapid development of social economy and the substantial improvement of people’s living standard,the number of social motor vehicles is increasing year by year,road traffic accidents,traffic jams and other problems are becoming very serious.In this context,traffic flow model,as an important means of studying road traffic,is paid more and more attention.Traffic flow modeling is a hot area of current traffic engineering research.As the cellular automata model simulates the microscopic motion of vehicles in traffic flow,it reveals the complex nonlinear behavior of traffic flow from free moving phase to local blocking phase,and analyzes the characteristics of traffic flow,etc.This area has unique advantages,so it has been widely used and developed in traffic flow research.This paper mainly studies the vehicle operating rules that change the traditional model in the defensive driving mode,and studies the cellular automata model based on the defensive driving single-lane and two-lane models.First of all,this paper studies the traditional model of cellular automata model 184,NaSch model and some improved models of the NaSch model.Compared with the traffic measurement phenomenon,the advantages and disadvantages of various models are compared,and then the simulation analysis of the two-lane model STNS model is carried out to study its basic diagram and lane changing ratio.Secondly,this paper makes improvements on the basis of the SDNaSch model,combining defensive methods with the CA traffic flow model.In the case where the front car is about to stop in the SDNaSch model,the rear car may accelerate this unrealistic phenomenon and make improvements.A one-dimensional cellular automaton model DD model based on defensive driving is obtained.The DD model can simulate the depression of the basic map of actual traffic and the speed transition phenomenon.It can effectively improve the proportion of sudden braking of the vehicle and a more stable synchronous flow appears.Finally,the evolution rules and lane changing rules of the STNS model are improved to obtain the STDD model,which makes the traffic flow more stable,improves the traffic flow and reduces the lane changing ratio.In this paper,the shortcomings of the classical model are improved,the advantages of the improved model are determined through simulation study and model comparison.The influence of parameters in the model on traffic flow is discussed in detail,and find the shortcomings of the improved model.