Providing Bus Priority Using Adaptive Pre-signals
Providing Bus Priority Using Adaptive Pre-signals
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发表时间：
2015
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通讯作者：
Haitao He;S. I. Guler;M. Menéndez
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作者：
Haitao He;S. I. Guler;M. Menéndez
公交优先在城市中很重要，以鼓励人们使用公共交通。然而，提供专用巴士线并非总是可行的。这可能也不是最有效的解决方案，特别是如果存在交通信号等瓶颈的话。本文探讨了一种替代策略，使用一个额外的信号上游的主要信号（一个预信号），以提供公交优先在信号交叉口。它的主要目的是让公交车在交叉口前跳过排队的汽车，而汽车仍然可以使用主信号处的所有车道，以充分利用交叉口的通行能力。本文制定了一个在线控制算法来操作这样的预信号基础设施的交叉口。控制算法的开发，通过确定最佳的运营策略，在每个需求水平的交叉口使用微观仿真模型VISSIM。在一个模拟案例研究中，据观察，相比使用专用的公交车道，在高峰时段的交叉口上游的拥堵减轻。同时，与使用混合车道相比，非高峰时段的平均人延误较低，并提供公交优先。因此，可以得出结论，实施预信号与建议的在线控制算法提供了一个很好的平衡之间提供总线优先级和维持汽车吞吐量。
Bus priority is important in cities to encourage people to use public transport. However, providing a dedicated bus lane is not always feasible. It might not be the most efficient solution either, especially if bottlenecks such as traffic signals exist. This paper examines an alternative strategy to use an additional signal upstream of the main signal (a pre-signal) to provide bus priority at signalized intersections. Its primary purpose is to allow buses to jump the car queues before the intersection while cars can still use all the lanes at the main signal to fully utilize the capacity of the intersection. This paper formulates an online control algorithm to operate an intersection with such pre-signal infrastructure. The control algorithm is developed by determining the best operating strategy for the intersection at each demand level using a micro-simulation model in VISSIM. In a simulation case study, it is observed that compared to using a dedicated bus lane, the congestion upstream of the intersection during peak hours mitigated. Meanwhile, compared to using mixed-use lanes, the average person delay during the off-peak hours is lower and bus priority is provided. Therefore, it is concluded that implementing a pre-signal with the proposed online control algorithm provides a good balance between providing bus priority and sustaining car throughput.