短连线信号交叉口的元胞自动机模型

Cellular Automata Model of Short-link Grouped Intersections

提出了短连线交叉口元胞自动机交通流模型。采用开放性边界条件,模拟了短连线交叉口的交通流。研究了交通信号灯控制下短连线交叉口的交通流特性。分析了相位差、连线长度、信号周期、产生概率、消失概率对交通流的影响。结果表明:相对于长连线交叉口来说,短连线交叉口交通流量不仅决定于上游交叉口的通行能力,而且与连线长度、信号周期和相位差相关;连线长度确定时,存在使主干道和支线交通流量达到最大的最佳相位差;随着连线长度的增大,相位差对主干道和支线交通流的影响逐渐减弱;在最佳相位差时,信号周期长度对交通流量无明显影响。

A cellular automata model of traffic flow on short-link grouped intersections is proposed. Under the open boundary conditions, the traffic flows on short-link grouped intersections are simulated. The traffic flow characteristics at short-link grouped intersections under traffic signal control are researched. The effects of offset, length between intersections, signal cycle, input probability and output probability on traffic flow are analyzed. The result indicates that （1） related to long-link grouped intersections, the traffic flow on shortlink grouped intersections is determined not only by the capacity of the upstream intersection but also by length between intersections, signal cycle and offset; （2） when the length between intersections is determined, the optimum offset which makes traffic flow on the main stem and laterals achieve maximum is exist ; （3） with the increase of length between intersections, the influence of offset on traffic flow of the main stem and laterals gradually weakens; （4） at the best offset, the length of signal cycle has no significant effect on the traffic flow.