【摘要】 在定时式协调信号控制的背景下,以加快BRT车辆运行速度,降低信号优先给社会车辆造成的负面影响为目标,以实现绿灯时间再分配的纵向平等性为基本要求,提出了一种新颖的干道BRT主动信号优先方法。在BRT专用道沿线布设3类检测器,采集BRT车辆的到达时刻。定义了绿灯延长、相位插入、绿灯早启3类优先请求时间窗,有条件地生成和删除不同类型的优先请求,有节制地实施相位插入。给出信号优先贡献和补偿的混合作用方式以及协调方向的社会车辆连续行进的保障措施。遵循纵向平等性的要求,建立信号优先贡献算法和信号优先补偿算法。在高负荷机动车交通需求下进行仿真试验,给出该方法的最佳参数取值建议;BRT车辆的行程时间降幅超过28%,协调方向社会车辆的行程时间增幅不足5%的结果验证该方法的有效性;BRT车辆的行程时间降幅超过19%、社会车辆的车均延误差异不足1%的结果验证该方法相较于传统方法的优越性。更多还原

【Abstract】 With the goal of expediting the operating speed of bus rapid transit(BRT) vehicles and minimizing the adverse effect of signal priority on general traffic, an active signal priority technique was developed for a BRT system along an arterial with permitted signal coordination. Green time reallocation due to signal priority was performed based on the vertical equity principle. Three types of traffic detectors were placed on BRT-only lanes to detect BRT vehicle arrivals. Time windows for green extension, phase insertion, and early green were defined to conditionally generate and cancel priority requests. Phase insertion was provided when a few strict conditions were met. Hybrid functioning of signal priority treatment and recovery allowed more BRT vehicles to trigger priority requests. Signal progression of general traffic was maintained by limiting the deviations against the programmed offset and bandwidth. Algorithms for signal priority treatment and recovery were established to meet the requirement of achieving vertical equity. Recommendations were established for the configuration of the parameters of the proposed technique in accordance with the results of the simulation experiments that were conducted in heavy load scenarios. The effectiveness of the proposed technique was verified by the result: the average travel times of BRT vehicles decrease by at least 28%, whereas the average travel times for coordinated movements increase by at most 5%. The operational advantage of the proposed technique over the conventional technique was confirmed by the result: the average travel times of BRT vehicles decrease by at least 19%, whereas the change in the average vehicle delays are less than 1%.更多还原