Abstract

The lane closures caused by the work zone at the approaches create a negative impact on the operational effectiveness of the signalized intersections. This paper presents an innovative design for intersections with work zones to improve the intersection’s practical capacity. In this design, the lanes in the leg with work zone can be used dynamically as approach and exit lanes during different periods of a signal cycle by using the pre-signal. An optimization model for an optimal geometric layout and signal timing design is built to capture real-world operational constraints, including the lane assignment, the signal timing of the main signal and pre-signal, the distance of the mixed-usage area and the transition area, and the degree of saturation restriction. A case study and extensive numerical analysis demonstrate the effectiveness of the prospective design as compared with conventional designs under different geometric layout and traffic demand situations. Overall, the proposed design can lead to an increment in the practical capacity of the intersection with a work zone (by up to 30%) and reduce the average vehicular delay accordingly (by 50%) without necessitating an expansion of the intersection. The results show that the promising application of the proposed design when the length of the work zone is less than 160 m.

摘要

引道处工作区造成的车道关闭对信号交叉口的运营效率产生负面影响。本文提出了具有工作区的交叉口的创新设计，以提高交叉口的实用能力。在该设计中，可以通过使用预信号，在一个信号周期的不同时段内，将带有工作区的路段中的车道动态地用作进出车道。建立优化几何布局和信号时序设计的优化模型，以捕捉现实世界的操作约束，包括车道分配、主信号和预信号的信号时序、混合使用区域的距离和过渡面积和饱和度限制的程度。案例研究和广泛的数值分析证明了前瞻性设计与不同几何布局和交通需求情况下的传统设计相比的有效性。总体而言，所提议的设计可以增加工作区交叉口的实际容量（最多 30%），并相应地减少平均车辆延误（50%），而无需扩大交叉口。结果表明，当工作区长度小于 160 m 时，所提出的设计具有良好的应用前景。所提议的设计可以增加与工作区交叉口的实际容量（最多 30%），并相应地减少平均车辆延误（减少 50%），而无需扩大交叉口。结果表明，当工作区长度小于 160 m 时，所提出的设计具有良好的应用前景。所提议的设计可以增加与工作区交叉口的实际容量（最多 30%），并相应地减少平均车辆延误（减少 50%），而无需扩大交叉口。结果表明，当工作区长度小于 160 m 时，所提出的设计具有良好的应用前景。