信号控制交叉口左转相位协调设计方法

基于左转交通流的路径分析,给出了相邻交叉口左转相位协调优化的约束条件,包括流量守恒、绿灯最大最小时间、饱和度和周期时长等.考虑不同左转相位设置模式,建立了相邻交叉口间通行能力差计算模型.在此基础上,以通行能力差最小为目标,提出了相邻交叉口左转相位协调设计模型.最后,基于两个实际交叉口的几何条件和交通流数据,采用车均延误和最大通过量为指标对比分析了交叉口现有方案、Synchro优化方案和本文模型优化方案的信号控制效益.结果表明,基于本文模型的相位方案,能降低各交叉口间的通行能力差值,并有效降低交叉口群的车均延误,提高交叉口群整体通行能力,同时该协调设计方法对整个系统的负面影响较小.

Integrated Optimization Method for Left turn Phases of Adjacent Junctions

Based on an analysis of the available routes for left turn movements, a set of constraints was set up to optimize left turn phases coordinately including flow conservation, duration of green, degree of saturation, cycle length and so on. Capacity gap computation model was proposed between adjacent intersections with different left turn phases, then, with the objective of minimizing capacity gap, integrated optimization model for left turn phases of adjacent junctions was formulated. Based on the geometry layout and traffic flow data of two field intersections, average vehicle delay and maximum throughput were applied to a comparative evaluation of the field method, Synchro based method and the proposed method. The results show that with the proposed method, the capacity gap between the adjacent intersections and the delay decreases, while the capacity enlarges in comparison with the field and Synchro based mothod with only a slight adverse effect on the system.