基于预信号的交叉口公交相位插入策略设计

Design of transit phase insertion strategy at intersections based on pre-signals technique

为降低公交车辆在多相位信号控制交叉口的延误，根据公交信号优先原理设计了一种公交相位插入策略．首先，基于预信号控制方法设计了策略的进口道设置和控制逻辑，建立了保证各相位饱和绿灯时间下的策略控制参数计算模型；然后，应用排队累积图示法建立了以公交车辆与非优先车辆的车均延误变化量为指标的策略效益计算模型，发现在不同交叉口饱和度（0．50～0．90）下执行策略，公交车辆车均延误降低量均大于非优先车辆车均延误增加量，且饱和度越低，两者相差越大．最后通过实例仿真进行了验证分析，研究结果表明：在适中的交叉口饱和度（≤0．9）情况下，执行基于预信号的公交相位插入策略能够在不显著影响非优先车辆运行的同时，有效降低公交车辆的延误．

A transit phase insertion strategy was designed based on the theory of transit signal priority to decrease bus delay at multi-phase intersections.Firstly,the pre-signals technique was used to de-sign layout and control logic.The calculation models of control parameters ensuring the saturation green time of each phase satisfied were established.Then,calculation models of efficiency analysis with the index of average delay of buses and non-priority vehicles were built based on the cumulative arrival departure diagram.At different intersection saturation （from 0.50 to 0.90）,the average de-crease delays of buses are all large than those of non-priority vehicles;and the difference became lar-ger with the decrease of the saturation.A simulation example was done to validate the strategy.The results show that the execution of strategy at adequate intersection saturation （≤0.9）can decrease bus delay efficiently with no significant effect on the operation of non-priority vehicles.