单点全感应式信号控制方法的参数取值

Configuring parameters of fully actuated control at isolated signalized intersections

以典型的四路交叉口为例,介绍了一种基于车辆时距的单点全感应信号控制方法,解读了相位显示顺序、车辆时距阈值、检测区域位置、左转相位的最小绿灯时间、直行相位的最小绿灯时间、左转相位的最大绿灯时间相对增量、直行相位的最大绿灯时间相对增量等参数的作用及其适宜的取值范围。利用VISSIM和VisVAP建立仿真试验环境,采用正交试验设计安排探索性试验方案,通过方差分析和直观分析,筛选出对交叉口车均延误具有重要影响的参数并确定它们的最佳取值。验证性试验结果证实了相关参数最佳取值的有效性。

Taking a typical four-leg intersection as an example,the operational mechanism of a gap time-based fully actuated control is briefly presented.The appropriate ranges of the values of seven parameters are given based on interpretation of their functions to operate signals.These parameters include:the phase sequence option,the critical gap time,the detection zone location,the minimum greens of a left-turn phase and a through phase,the relative increment of the maximum greens of the left-turn phase and the through phase.Simulation experimental environment is established using VISSIM and VisVAP.The orthogonal experimental design is used to arrange the exploratory experiments,in which the parameters that have significant impact on the average vehicle delay are identified and their optimal values are determined according to the results of analysis of variance and visual analysis.Confirmatory experiments demonstrate that the optimal values lead the average vehicle delays to be smaller.