交叉口直行待行区的车辆延迟启动策略分析

Analysis of Delayed Starting Strategy for Through Vehicles at Intersection Waiting-zone

道路交叉口设有直行待行区可提高其通行能力,但车辆进入直行待行区的时机将会影响车辆停车次数与车道容量。为减少交叉口的平均停车次数,利用交通流波动理论分析因设置直行待行区产生的交通流集散波状态,建立了一种以车流到达率及排队长度为约束条件,以降低交叉口平均停车次数为优化目标的车辆延迟启动模型。该模型可得出车辆进入直行待行区的最佳时机以减少停车次数,并避免因延迟启动导致的排队溢出。以上海市宜山路-虹梅路交叉口为案例展开了研究,通过VISSIM进行了仿真验证。结果表明:该策略在避免排队溢出条件下,在车流高峰期时可降低平均停车次数19%,在车流平峰期可降低35.2%。

Road intersection with through waiting zone can increase its capacity,but the moment of vehicle enters into the through waiting zone will affect the number of vehicle parking and road capacity. In order to reduce the average number of parking at intersection,the traffic flow gather-disperse wave state due to setting through waiting-zone is analysed by using traffic flow wave theory,a vehicle delayed starting model that taking traffic arrival rate and queue length as the constraints and taking reducing the average number of stops at intersection as the optimization objective is established. This model can be used to obtain the vehicle＇s best moment of entering into through waiting-zone to reduce the number of parking and avoid the queue overflow caused by delayed starting. The case study of the intersection of Yishan Road and Hongmei Road in Shanghai is conducted,which is simulated and verified by VISSIM. The result shows that this strategy can reduce the average number of parking by 19% at the peak traffic period and reduced by 35. 2% at normal traffic period in the state of avoiding queue overflow.