考虑绿波控制的双相位移位左转交叉口效用分析

Utility analysis of dual phase displaced left-turn intersection considering green wave control

针对移位左转交叉口的交通冲突问题,提出了一种移位左转交叉口渠化模型.综合分析路段交叉口预信号与主交叉口信号之间的复杂关系,基于绿波控制理论,以车均延误最小为目标函数,构建了基于绿波控制的移位左转交叉口信号控制优化模型,利用Lingo软件进行求解.基于VISSIM仿真,分别从交叉口饱和度、左转交通量、直行交通量3个方面对该方案的适用性进行分析,同时利用武汉市中山路与民主路交叉口的数据验证该方案的效果.研究结果表明:当交叉口饱和度大于0.8时,该方案的改善效果显著;优化后的移位左转交叉口总车均延误和左转车均延误较优化前下降了7.6%和48.2%,验证了优化方案的有效性;当左转交通量占交叉口总交通量比重较大时,采用优化后的信号控制方案,交叉口总车均延误的降低效果更加显著.

Aiming at the problem of the traffic conflict at the displaced left-turn intersections(DLI),a channelization model of DLI is proposed.The complex relationship between the pre-signal of the middle intersection and the signal of the main intersection is analyzed comprehensively.Based on the green wave control theory and taking the minimum average delay of vehicles as the objective function,a signal control optimization model of DLI based on green wave control is established and solved by Lingo software.Based on VISSIM simulation,the applicability of the scheme is analyzed from the three aspects of intersection saturation,left-turn traffic volume,and straight traffic volume.Meanwhile,the data of the intersection of Zhongshan Road and Minzhu Road in Wuhan is used to verify the effectiveness of the scheme.The results demonstrate that when the saturation of the intersection is greater than 0.8,the improvement effect of the scheme is significant.The average delay of intersection and left-turn vehicle of the improved DLI decrease by 7.6%and 48.2%compared with that before the improvement,which verifies the effectiveness of the optimized scheme.When the left-turn traffic volume accounts for a large proportion of the total traffic volume at the intersection,the optimized signal control scheme can reduce the average delay of the total vehicle at the intersection more significantly.