Coordinated Optimization of Signal Timings for Intersection Approach with Presignals
Coordinated Optimization of Signal Timings for Intersection Approach with Presignals
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DOI：
10.3141/2355-10
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发表时间：
2013-01-01
影响因子：
1.7
通讯作者：
Luo, Zhenke
中科院分区：
文献类型：
--
作者：
Ma, Wanjing;Xie, Hanzhou;Luo, Zhenke
由于几何条件的限制，许多拥堵的交叉口在通行能力不足的情况下交通量很大。在街区中央位置安装预信号和重新组织十字路口引道上游的交通，是解决这些容量限制的一种有前途的、经济高效的方法。为提高受保护的左转相位通行能力，建立了带预信号的单交叉路口协调优化模型。预信号模型基于两个原则：(A)通过对交叉口排队过程和交叉口时空限制的通行能力约束的建模，明确地捕捉预信号和主信号之间的相互作用；(B)优化预信号和主信号的信号配时以及它们之间的偏移量，以产生该方法的最佳运营策略。考虑了最小绿灯时间和最小延误问题。大量的实验分析表明，前置信号模型的性能优于常规控制方法(无前置信号)。对信号配时方法进行了灵敏度分析，该方法将帮助交通工程师选择合适的分选区长度、相序和预信号的早期启动时间。这项研究的结果为交通从业者、研究人员和当局提供了一个基础，用于在需要增加拥堵交通的交叉口通行能力的位置上设计和利用预信号。
Many congested intersections have heavy traffic volume on movements for which there is insufficient capacity because of geometric limitations. Installing presignals at midblock locations and reorganizing traffic upstream of the approach of an intersection combine to be a promising and cost-effective method for addressing these capacity limitations. A coordinated optimization model was developed for an isolated intersection approach with presignals to increase the protected left-turn phase capacity. The presignal model was based on two principles: (a) explicitly capture the interaction between the presignal and the main signal by modeling the queuing process and capacity constraints of temporal and spatial limitations of the intersection and (b) optimize the signal timings of both the presignal and the main signal as well as the offset between them to produce the best operational strategy for the approach. The minimum green time required and the delay-minimization problems are considered. Extensive experimental analysis has shown that the presignal model outperforms the conventional control method (without presignal). Sensitivity analysis of the signal timing method that will assist traffic engineers with selecting the appropriate length of the sorting area, phase sequence, and early starting time of presignals was conducted. The results from the study offer a basis for traffic practitioners, researchers, and authorities on which to design and utilize presignals in locations where there is a need to increase intersection capacity for congested movements.