协调控制交叉口短车道长度和配时参数协同优化

Synergistic optimization of short lane length and signal timing parameters for adjacent intersections with coordinated signals

为了优化配置共有路段上均含左转短车道的相邻协调控制交叉口的时空资源,以最大化交叉口通行能力和最小化车辆总延误为目标,以左转短车道长度和相位有效绿灯时间为决策变量,建立了交叉口周期时长与绿信比组合优化模型。为验证优化模型的有效性,设计了一个案例,使用优化模型和韦伯斯特模型分别获得每个交叉口的配时方案,并使用已有方法计算了相邻交叉口协调相位的绿时差,进而使用VISSIM软件模拟了两种配时方案下的交通流运行状况。结果显示:与韦伯斯特方法相比,本文优化方法能使交叉口车均延误降低约30%,而通过车辆数略有增加。

To optimally allocate the time and space resources for two adjacent intersections with coordinated signals and short left-turn lanes on the common section of a road, an optimization model was presented to jointly obtain the signal cycle length and green slit for each intersection. The objectives are to maximize the passing capacity of the entire intersection and minimize the total delay of vehicles. The decision variables of the model are the length of each short left-turn lane and the effective green time per phase. A case was designed to verify the effectiveness of the proposed model. First, two signal timing plans for each intersection were obtained using the proposed model and Webster model, respectively. Then, the offset between coordinated phases was calculated by a known method. Finally, the traffic operations under the two signal timing scenarios were simulated using VISSIM software. The outcomes show that the unit delay is decreased by 30% and the vehicle throughput is slightly increased for each intersection under the optimization scenario.