The Study Of Urban Microscopic Traffic Simulation Software And Its Development

The number of motor vehicles has a rapid growth in China, which lead to a sharp increase in demand for urban transport. But the capability of road network is more and more unable to catch up the traffic growth. Because of that, traffic jams, traffic accidents, environmental pollution and energy waste are being increasingly serious and all of them become the hot focus of social concern. The use of urban traffic simulation technology can simulate the dynamic traffic flow and traffic accidents and other transport phenomena realistically and analyse the vehicles, drivers, pedestrians, roads, and traffic characteristics of the traffic flow in-depth and research traffic planning, traffic organization and management traffic areas, energy conservation effectively.In our country, motor vehicles, non-motor vehicles and pedestrians mixing together is a distinctive feature of urban traffic, all kinds of traffic flowing through the intersection at the same time bring mutual interference. The serious conflict will cause frequent traffic jams, traffic efficiency decline, and the intersection become bottlenecks of urban transportation development. In order to improve the implementation of transport planning and control under the current road conditions, to execute traffic induced and accidents handling when the traffic congestion is appeared in the road network, to improve traffic efficiency, we must focus the research on intersection traffic flow. Microscopic traffic simulation is an important means to study the intersection of traffic. The MTSS (Micro-scopic Traffic Simulation Software) developed by System Simulation and Control Research Cente of Wuhan University of Technology can be used to simulate the human-vehicle-road interaction of the intesection and describe the various implementation process of traffic control strategy. The various data obtained from simulation can be used to traffic analysis, forecasting, traffic management, control and program evaluation.This paper mostly tries to optimizing and improving some models of the MTSS, and studies its application in a typical intersection, completing the following tasks:1. The generation model of the MTSS uses negative exponential distribution, which is a special case of the Erlang distribution when its parameter k= 1. So the generation model in this paper uses the Erlang distribution, which can simulate different densities'traffic flow, the application range is more wide. Meanwhile, this paper improves on the car following model from based on safe distance to based on expectation headway-time, and improves on the signal timing strategy from fixed cycle to variable cycle. And road network automatically generated model, changing model also have been optimized and improved, which make the MTSS more versatile. And this paper achieves the program development in Visual C++6.0 environment.2. Realizing the visual part of the microscopic simulation by using the real-time visual simulation software Vega, and can dynamicly show the simulation process in real-time.5. Processing the road-test data obtained from the actual traffic flow of typical intersection, analyse the traffic flow characteristics, then determine the vehicle generation model, the car following model and their parameters. Simulating the typical intersection by using MTSS. The simulation results are compared and analysed, which can be used for traffic control management program and evaluation.