网联交通环境下交叉口进口车道动态配置方法

Dynamic Configuration Method for Approach Lanes at Intersections in Connected Traffic Environment

现有网联交通环境下的优化控制方法未能实现CAV(Connected andAutomatedVehicle)专用车道的动态复合利用,鉴于此,本文考虑交通需求及CAV渗透率的实时变化,以车道组内不同功能车道流率比均衡为约束,交叉口全部车道组流率比之和最小为优化目标,构建基于转换指数的CAV共享车道动态配置方法,提出左转CAVs与直行CAVs复合利用CAV共享车道的控制方法,并设计优化求解流程。基于VISSIM中COM组件开发算法,更新车辆轨迹并在CAV/CHV(Connected Human-drivenVehicle)与信号控制器之间交换信息。仿真结果表明,提出的配置策略增强了交叉口适应实时交通需求的动态调节能力,能在一定程度上改善车均延误。进一步分析表明:CAV渗透率对是否设置CAV共享车道及设置几条车道密切相关;在交叉口进口车道条数为4的情况下,当CAV渗透率小于0.35时,不设置CAV共享车道效果最好;当CAV渗透率介于0.35~0.70时,设置1条CAV共享车道效果最佳;当CAV渗透率超过0.70时,宜设置2条及以上CAV共享车道。本文提出的优化方法适用于网联交通环境下中高CAV渗透率的多车道交叉口。

The existing optimization control methods in the connected transportation environment have failed to achieve dynamic composite utilization of connected and automated vehicle(CAV)dedicated lanes.In view of this,considering the real-time changes in traffic demand and CAV penetration rate,this paper constructs a dynamic configuration method for CAV-shared lanes based on conversion index.This method can not only achieve equilibrium in the flow rate ratios of different functional lanes within the same lane group,but also minimize the sum of the flow rate ratios of all lane groups at the intersection and compress the signal cycle.On this basis,a control method for utilizing CAV-shared lanes between left-turn CAVs and through CAVs is proposed,and the optimized solution process is designed.The program is developed using COM module in VISSIM software to update vehicle trajectory and exchange information between CAV and connected human-driven vehicle(CHV),and the signal controllers.The simulation results show that the proposed configuration strategy enhances the dynamic adjustment ability of intersections to adapt to real-time traffic demand,which can improve average vehicle delay to a certain degree.Further analysis shows that the CAV penetration rate is closely related to whether there are CAV-shared lanes and how many CAV-shared lanes on the approach.When there are four approach lanes at an intersection and the CAV penetration rate is less than 0.35,the intersection shows best operation without a CAV-shared lane.When the CAV penetration rate is between 0.35 and 0.70,one CAV-shared lane provides operational benefit.When the CAV permeability exceeds 0.70,two or more CAV-shared lanes would provide operational benefit.The proposed optimization method is suitable for multi-lane intersections with medium to high CAV penetration rate.