Multi-phase bus signal priority strategy at isolated intersections

一种单点多相公交信号优先控制策略(英文)

To satisfy the multiple priority requests from buses that arrive at different phases within a small time window, a multi-phase bus signal priority （MPBSP） strategy is developed. The proximity principle is brought forward to settle the conflicts among multiple priority requests and arrange the optimal priority sequence. To avoid over saturation of the intersection, a conditional MPBSP algorithm that adopts early green and green extension strategies is developed to give priority to the bus with the highest priority level when green time that each phase runs makes its saturation degree not larger than 0. 95. Finally, the algorithm is tested in the VISSIM environment and compared with the normal signal timing algorithm. Sensitive analysis of the number of priority phases, bus demand, and volume to capacity ratios are conducted to quantify their impacts on the benefits of the MPBSP. Results show that the MPBSP strategy can effectively reduce bus delays, and with the increase in the number of priority phases, the reduction range of bus delays also increases.

为满足交叉口短时间内多个方向有公交车到达时的信号优先需求,提出了一种单点多相公交信号优先策略.针对不同相位公交优先申请间的冲突,提出了"就近原则"以合理安排各公交车的优先级别并确定最佳优先顺序.为避免出现过饱和现象,提出了一种有限优先策略,即在各相位饱和度不超过0.95的情况下,采用绿灯延长、绿灯提前启亮给予具有最高优先级别的公交车信号优先.在VISSIM中验证了所提算法的有效性,并与普通信号配时进行对比;分析了优先相位数、公交需求、交叉口流量比等因素对算法效益的影响.结果表明:多相公交信号优先算法能有效降低公交车延误,且随着优先相位数的增加,交叉口公交车延误降低幅度越大.