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Mathematical Problems in Engineering
Volume 2012 (2012), Article ID 650242, 10 pages
http://dx.doi.org/10.1155/2012/650242
Research Article

Modeling of Signal Plans for Transit Signal Priority at Isolated Intersections under Stochastic Condition

School of Traffic and Transportation, Lanzhou Jiaotong University, Gansu, Lanzhou 730070, China

Received 10 May 2012; Revised 30 August 2012; Accepted 30 August 2012

Academic Editor: Wuhong Wang

Copyright © 2012 Lv Bin. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Transit signal priority (TSP) is recognized as having the potential to improve transit service reliability at small cost to general traffic. The popular preference for TSP encounters the challenges of various and challenging test scenarios. According to the stochastic characteristics of traffic flow, the signal timing model was established for TSP at an isolated signal intersection, where the passenger average delay was used as the optimization objective, and the weights of all phases were considered. The priority logic that is considered in the study provides cycle length and green time within a fixed-time traffic signal control environment. Using the Gauss elimination, the quantitative relationships were determined between phase clearance reliability (PCR), cycle length, and green time. Simulation experiments conducted by the particle swarm optimization (PSO) algorithm indicated that (1) the random variation of arrival rate has an obvious effect on traffic signal settings; (2) the proposed TSP model can reduce passenger delays, especially under stochastic traffic flow.