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对于公交信号优先的研究侧重于已知周期下优先策略的效益及参数,所采用的周期不一定最优。考虑协调控制约束的基础上,以主路上关键交叉口为对象,量化讨论了3种典型TSP策略对延误造成的影响。建立了基于优先策略最大可能效益的最佳周期模型。并结合实例分析了实际可能流量条件变化对主动信号优先策略最佳周期的影响。结果表明:在特定流量组合下,增加传统TRRL公式得到的周期存在一定效益,增加幅度随优先相位与非优先相位流量之比增加而变大,可针对流量条件动态选取运行周期。此外,对比发现红灯早断策略的效果略优于绿灯延长策略。
The study of bus signal priority focuses on the benefits and parameters of prioritized strategies under known cycles, and the period used may not be optimal. On the basis of considering the coordination control constraints, the impact of three typical TSP strategies on the delay is quantified and discussed based on the key intersections on the main road. The best period model based on the most probable benefit of priority strategy is established. The influence of the change of actual traffic condition on the best period of active signal priority strategy is analyzed with examples. The results show that there is some benefit for the period obtained by adding the traditional TRRL formula under a certain flow combination, which increases with the increase of the ratio of the priority phase to the non-priority phase flow, and the operation period can be dynamically selected according to the flow conditions. In addition, the comparison shows that the effect of the red light breaking strategy is slightly better than the green light stretching strategy.