考虑干线协调控制的信号交叉口左转弯待转区设计方法

The Design of Left-turn Waiting Areas at Signalized Intersections Considering Signal Coordination

为权衡信号交叉口左转弯待转区设计对左转车流和直行车流运行效率的影响,根据信号相位设置方式和是否设置左转弯待转区提出六种设计方案,并建立VISSIM仿真模型,采用MAXBAND模型进行干线交通绿波带宽计算.以车均延误最小化为目标,得到不同交通条件下的六种方案比选结果.结果表明,考虑干线协调控制的信号交叉口左转弯待转区设计方法能够有效地协调左转车流与直行车流车均延误之间的矛盾,提高整个交通系统的运行效率.

To evaluate the impacts of left-turn waiting areas on the operational performance of the left turn and through movement at the signalized intersections, six different scenarios are defined accord- ing to the type of phase sequence and that whether the left-turn waiting areas are implemented. The VISSIM simulation models are established to evaluate the operational impacts of various designs. The computer program MAXBAND is used to calculate the maximized progression bandwidth. The pro posed six scenarios are ranked according to the average control delay of vehicles at the signalized inter- sections. The design of left-turn waiting areas at signalized intersections considering signal coordination proposed in this paper can effectively balance the trade-off between the performance of left-turn and through traffic, so as to improve the overall system performance.