The Design Of The Roads Traffic Microscopic Simulation System

Traffic simulation system is one of the important research directions of intelligent traffic system.As the urban traffic congestion becomes more and more serious,the research of traffic simulation system has developed rapidly.In many traffic simulation systems,the roads microscopic traffic simulation system has the advantage of being able to simulate the individual behavior of vehicles in the regional road network in an actual traffic system,as well as the advantage of customizing the regional road network and accessing different signal control schemes.Therefore,it is often used to evaluate road planning scheme,traffic signal control scheme and other measures to improve traffic conditions.In order to ensure the practical reference value of the microscopic simulation system,ensuring that the behavior of the simulated vehicle has a high similarity with real traffic is a must.Therefore,this article focuses on the study of various types of vehicle behavior and then establishes the mathematical model of corresponding one,based on which the microscopic simulation system is designed.The design of road traffic microscopic simulation system starts with the analysis of the simulation purpose requirement to determine the overall function of the microscopic simulation system.Then,the road network module,departure module,vehicle behavior module and signal control module are designed according to different functional requirements.After that,it briefly introduces the structure of simulation roads and the species distribution of the lamp groups.On the basis of the real kinetic characteristics of individual vehicles,this paper makes a primary research on the two main behaviors of car following and lane change in vehicle behavior,both of which are affected by the driver's personality characteristics in a real traffic system.After analyzing the results,a vehicle behavior model is established.Thereinto,the car-following model includes car-following condition discrimination and car-following behavior.The former model which is more frequently adopted at present is the optimization speed model.This paper has improved the calculation formula of the desired spacing and made a comparison with the existing model,so as to solve the problem that the following range of vehicle speed fluctuation is relatively larger when the speed of the front vehicle is small.In order to establish the lane change model,this text analyzes the generation of the demands for lane changing and the feasibility of lane changing.Serving as the implementation criterion of the lane changing behavior,the demands for lane change are affected by the driver's characteristics.By comparing the expected gap with the current one,the feasibility of lane change can be judged,after which the model for the implementation of the lane change behavior can be derived.Finally,this paper analyzes the software design method of each module of the microscopic simulation system,and realizes the application of the vehicle behavior model in the road traffic microscopic simulation system by completing the program design of the model on the basis of the vehicle behavior model.Ultimately,in the analysis of the operation results of the microscopic simulation system,the validity of the vehicle behavior model and other module design methods has been verified.