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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%。
The existence of a direct-to-pedestrian zone at road intersections will enhance its capacity to travel, but the timing of vehicles entering the direct-to-pedestrian zone will affect the number of vehicle stops and lane capacity. In order to reduce the average number of stops at the intersection, the traffic flow fluctuation theory is used to analyze the state of the traffic flow distribution caused by the setting of the straight-ahead pedestrian zone. A traffic-flow arrival rate and queuing length constraint are established to reduce the average parking at the intersection The number of vehicles for the optimization goal delay starting model. The model gives the best timing for the vehicle to enter the pedestrian zone to reduce the number of stops and to avoid a queue overflow due to delayed start-up. Taking Shanghai Yishan Road - Hongmei Road intersection as a case study, the simulation was carried out by VISSIM. The results show that this strategy can reduce average parking frequency by 19% and reduce 35.2% during the rush hour of traffic flow under the condition of avoiding queue overflow.