Increasing the Flow Capacity of Signalized Intersections with Pre-signals: Theory and Case Study
Increasing the Flow Capacity of Signalized Intersections with Pre-signals: Theory and Case Study
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发表时间：
2011
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通讯作者：
Yiguang Xuan
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作者：
Yiguang Xuan
作者(S)：宣一光|顾问(S)：达甘佐，卡洛斯·F；卡西迪，迈克尔·J|摘要：本文提出了一种新的交通重组和增加信号交叉口通行能力的串列设计。在串联设计中，使用中间块预信号来对左转车辆(LV)和直通车辆(TV)进行串联分类，而不是像传统设计那样将它们并排放在一起。对于独立通过和左转相位的交叉口，串列设计优于传统设计，因为在至少一个交叉口信号相位期间，可以使用更多的车道来排放车辆。我们发现，在最简单的形式下，串列设计可以使交叉口的通行能力提高10%到20%。我们还研究了充分实现容量优势的块的长度要求，以及修改串联设计以减少这种长度要求。然后，我们在成都市的一个信号交叉口中国进行了案例研究。实例研究表明，串联式设计能有效提高交叉口通行能力。此外，案例研究表明，在执行公交专用道限制的同时，小汽车和公交车都可以受益。最后，我们以轿车和公交车为例，说明了如何将预信号串联排序的思想扩展到提高多式联运交叉口的通行能力。这一扩展建立在不同运输方式的排放时间是相加的假设上，这一假设得到了自然实验的证实。
Author(s): Xuan, Yiguang | Advisor(s): Daganzo, Carlos F; Cassidy, Michael J | Abstract: The dissertation proposes a new "tandem design" to reorganize traffic and increase the flow capacity of signalized intersections. In the tandem design, a mid-block pre-signal is used to sort left-turning vehicles (LVs) and through-moving vehicles (TVs) in tandem, rather than leaving them side by side, as in the conventional design. For intersections with separate through and left-turn phases, the tandem design outperforms the conventional one because more lanes can be used to discharge traffic during at least one of the intersection signal phases. We find that the tandem design can increase the intersection capacity by 10% to 20% in its simplest form. We also study the length requirement of blocks to fully realize the capacity benefit, and modifications of the tandem design to reduce this length requirement. We then conduct a case study at a signalized intersection in the city of Chengdu, China. The case study shows that the tandem design can effectively increase intersection capacity. Moreover, the case study shows that together with enforcement of the bus-lane restriction, both cars and buses can benefit. Finally, we demonstrate how the idea of tandem sorting with pre-signals can be extended to increase intersection capacity of multimodal traffic, using as an example the case of cars and buses. This extension hinges on an assumption that the discharge times of different modes of transport is additive, and this assumption is confirmed with a natural experiment.