Mesoscopic Simulation Of Traffic Flow On The City Road

Intelligent transportation system is the future of development of traffic. As an effective method to research the traffic system, the simulation technology is useful in this field. It can not only help the design of the traffic roads, but also provide the testing and estimate platform for the intelligent control and decision. This thesis introduces the traffic simulation technology and the research status in native and foreign countries. And it describes the aim and meaning of building up the mesoscopic simulation system of the traffic on the city road. And it introduces the object orientation technology of building up the model and the research of the object orientation mesoscopic traffic simulation model. This model includes vehicle create mode, cross signal control mode, vehicle running mode and cross routing choice mode. In this model, the vehicles are organized in the different groups. Every group includes a series of vehicles with the same traffic dynamics. We can update the speeds and positions of the vehicles according to the dynamics. Also this thesis uses the real time routing choice arithmetic to simulate the vehicles' diffluence at the exit of the link. Accordingly it simulates the running of the vehicles on the whole link through the mesoscopic way. And then it presents the system frame and system running flow. At the same time the thesis details the key species and functions. Then the thesis provides the output of the mesoscopic simulation and the contrast between the mesoscopic methods and the microscopic ones. On this way, the thesis proves the accuracy and wide application of the mesoscopic simulation. At last, the thesis makes a summary and points out the direction of the mesoscopic simulation system's development.