Headway-Based Multi-Route Transit Signal Priority at Isolated Intersection

Kejun Long,Jian Gu,Junjun Wei,Xiaoguang Yang

doi:10.1109/access.2020.3030686

Abstract

This article advances the issue of Transit Signal Priority (TSP) control by introducing an application to multi-route bus conflicting requests, capitalizing on the headways and improved total delay of a multi-route bus network. The headway-based TSP accommodating conflicting requests overcomes the shortcoming by the traditional “First Arrival, First Serve” strategy and presents significant improvement on bus service performance. According to the bus arrival time, expected headway, and headway deviation value, we establish an optimal signal control model which aiming to minimize the deviation between the bus headway and the expected headway. The case study analysis conducts three schemes: background cycle-based TSP, total delay-based TSP, and headway deviation-based TSP. The performance of headway-based TSP is compared against other two schemes under three different intersection scenarios. The results show that the headway-based TSP has the best effect on improving and balancing the headway stability and distribution. Compared with the scheme of background cycle and the minimum total bus delay, the bus headway deviation is decreased by 42.05% and 28.64% respectively. Compared with the scheme of background cycle, the bus parking delay time is decreased by 36%.

Highlights

In this research, a headway-based priority control method is proposed for multiple conflicting Transit Signal Priority (TSP) requests in a single intersection
The feature of headway-based control can be combined with the priority strategy of green light extension and red light early break, and make the overall headway much closer to the expected headway
The model based on the minimum total bus delay has the best efficiency in reducing bus delays at intersections

Summary

INTRODUCTION

Because there are many bus lines in Chinese cities, how to provide bus priority at signalized intersection is a practical problem when multiple buses arrive at the same time and apply for priority in the same cycle. B. RESEARCH PROBLEM This article studies that when buses arrive at the signalized intersection and apply for priority at the same time in a signal cycle, which bus should be selected to carry out priority in the case of not meeting all the requirements? Bus priority control strategy based on ‘‘headway’’ provides the solution for multiple buses applying for priority at the same time, as well as provide priority services for delayed buses or buses with large headway. As there are many bus lines, how to provide bus priority is a practical problem when multiple buses arrive at the same time and apply for priority in the same cycle. The purpose of this study is to provide higher priority services for buses with the ‘‘late’’ and ‘‘large headway’’ so as to reduce the delay of these special buses at intersections

LITERATURE REVIEW

Findings

CONCLUSION