Microscopic Traffic System Simulation Software Of Urban Road Network Based On Cellular Automata

The traffic simulation has become a powerful tool to study the road traffic problems, andhas been widely used in the fields of road design, traffic management, traffic safety analysis,intelligent transportation systems, etc. However, at present, the development of domestictraffic system simulation software is still at the stage of importing foreign software, lack thetraffic system simulation software conforming to the actual conditions of our country.According to this problem, this paper has studied a variety of modeling methods on trafficsimulation, and has designed and developed the microscopic traffic simulation software forurban road network based on cellular automata.Firstly, the modeling works of the system has been divided into two parts. The one is themodeling of the basic elements of urban road network, including delineation of the cellularspace for the roads and intersections and design of traffic light controller model. The otherone is the modeling of the dynamic behaviors of vehicles, including car-following behaviorand lane changing behavior. This paper has used the classical VDR model and Gipps modelto imitate the car-following behavior, and used an improved STCA model to imitate the lanechanging behavior. Secondly, the paper has surveyed and analyzed the traffic data in xi’anand researched a model of producing vehicles, which was conforming to real trafficconditions. After completing the basic modeling work, the paper has finished thedevelopment of microscopic traffic simulation system software by using Microsoft VisualStudio2008as software developing environment and C++as the programming language. Inaddition, the paper has designed the format of input file as well as the algorithm of vehiclesshortest path and so on.After simulation testing, the simulation system can simulate different traffic conditionswith different geometric shapes of urban road network and different traffic light timing plans,and has important research value on the study of road traffic problems (such as signal controlin intersection, traffic accidents, the capacity of road and the analysis of traffic congestionmechanism, etc). What’s more, the system has good expansibility and provides basis forfuture development on large-scale microscopic traffic simulation software.