基于元胞自动机分析变道行为对交叉口交通流的影响

Effect of Lane Changing Behavior on Traffic Flow at Signalized Intersection Based on Cellular Automata

城市道路中车辆不能完成变道而被迫停止在导向车道线前等待变道的现象严重影响了道路畅通。通过建立车辆在不能完成变道被迫停止在导向车道线前等待变道和继续行驶两种情况下的交叉口元胞自动机模型,对比分析了车辆不能完成变道而停止在导向车道线前等待变道的情况对道路交通流产生的影响。结果显示:由于部分车辆不能完成正常变道,从而被迫停止在导向车道线前的行为会严重阻碍后方车辆的行驶,缩短车辆自由行驶时间,增大红灯期间车辆排队的延误。在车辆不能完成变道停留于导向车道线前的情况下,可以通过调节导向车道线长度缓解交通通行压力。

The situation that vehicles can＇t complete lane changing behavior and have to stop before the guide line to wait for the change on urban roads has seriously influenced the road traffic. Cellular automata model at signalized intersection was used to simulate two kinds of lane changing behaviors. Two behaviors were respectively that vehicles couldn＇t complete lane changing behavior and were forced to stop before the guide lane to wait for the change or continue to run. The effect of the behavior that vehicles couldn＇t complete lane changing behavior and were forced to stop before the guide lane to wait for the change on the traffic flow was comparatively analyzed. The results show that the situation that parts of vehicles can＇t complete the normal lane change and are forced to stop before the guide lane will seriously hinder the driving of vehicles at the rear, which will shorten the free travel time of vehicles, and increase the queuing delay time of vehicles during the red light. When the vehicles can＇t complete lane changing behavior and are forced to stop before the guide lane, the traffic pressure can be released by reasonably adjusting the length of the guide lane.