基于元胞自动机的交叉口仿真平台研究

Simulation Platform for Non-signalized Intersection Based on Cellular Automation

元胞自动机是研究交通仿真的强有力工具.但以往的元胞自动机模型都对交通的局部规则进行大量简化,这种简化用于描述路段的车流规律是可行的,却很难真实反映交叉口复杂的车流运行状态.鉴于此,本文提出新的无信号交叉口二维元胞自动机模型.该模型的特点在于:(1)细化了元胞自动机交叉口模型;(2)引进了驾驶员在交叉口的微观行为模型,如车辆饱和流,跟车模型,穿越冲突交通流临界间隙理论等.这使得模型能充分考虑交叉口中各方向车流的冲突影响,更加真实地反映交叉口的车流规律.在此基础上,本文建立了一个单交叉口的仿真平台,经检验该平台是合理有效的.

Cellular automation （CA） is a powerful tool for transport simulation. The fact that the traffic local rules were greatly briefed in the case of traditional CA model, was feasible to describ the law of simple vehicle flows, yet prevented from realistically resposing the complicated traffic flow situations at intersections. In this paper, a new two-dimension traffic CA model for non-sigrdized intersection is present. The major properties of this model include： it is a much finer model of intersection and it introducing driving behaviors at intersections which has never been considered in CA models before, such as saturate flow, following model, and gap acceptance behavior and so on. Thus, the model makes it capacable to consider the conflicting effects of all traffic flows and represents the complicated traffic situations at intersections. Finally, a simulation platform for a single intersection is buih, which is proved to be reasonable and effective.