一种基于路网网格化的微观交通仿真模型

针对采用元胞自动机进行微观交通仿真空间分辨率较差的特点,提出了一种基于道路路网网格的微观交通仿真模型.通过在仿真前或者仿真期间设定一维车道和二维路口网格的大小,对道路路网进行不同空间分辨率的分割,但在仿真车辆运动模型方面,仍采用元胞自动机模型进行仿真.这样既保留了元胞自动机进行交通仿真的优点,又克服了该方法在空间分辨率较差方面的缺点.文中还通过仿真实验,对一维路网网格和二维路网网格大小的设置对仿真结果的影响进行了分析.分析的结果表明：不同的仿真空间分辨率对车辆的平均速度和车道/路口占有率有较大的影响,但对流量的影响不显著.

Microscopic Traffic Simulation Model Based on Road Network Grid

A microscopic traffic simulation model based on traffic network grid was proposed to overcome the low spatial resolution of Cellular Automata-based traffic simulation models. In this model, spatial resolution can be changed by setting different grid size for lanes and intersections before or during simulation, whereas the vehicular movement model is still a CA model. By doing so, the low spatial resolution of CA model can be overcome and the advantages of using CA to simulate traffic are preserved. An analysis of the impact on the simulation output of different 1D lane grid size and 2D intersection grid size was proposed. The analysis results reveal that the size of grid poses influences on the average speed of vehicles and lane/intersection occupancy, but does not affect the volume of traffic greatly.