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Mathematical Problems in Engineering
Volume 2014 (2014), Article ID 412132, 11 pages
Research Article

An Improved Algebraic Method for Transit Signal Priority Scheme and Its Impact on Traffic Emission

1School of Transportation, Southeast University, Nanjing 210096, China
2Department of Civil and Environmental Engineering, University of California-Berkeley, Berkeley, CA 94720-5800, USA

Received 4 March 2014; Accepted 14 April 2014; Published 11 May 2014

Academic Editor: Wuhong Wang

Copyright © 2014 Yanjie Ji et al. 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.


Transit signal priority has a positive effect on improving traffic congestion and reducing transit delay and also has an influence on traffic emission. In this paper, an optimal transit signal priority scheme based on an improved algebraic method was developed and its impact on vehicle emission was evaluated as well. The improved algebraic method was proposed on the basis of classical algebraic method and has improvements in three aspects. First, the calculation rules of split loss are more reasonable. Second, the delay caused by transit stations and queued vehicles can be considered. Third, measures for finding optimal ideal intersection interval are improved. By establishing a microscopic traffic emission simulation platform based on microscopic traffic simulation model VISSIM and the comprehensive modal emission model (CMEM), the traffic emissions can be evaluated. Then, an optimal transit signal priority scheme based on the traffic data collected in Changzhou city was developed and its impact on emission was simulated in the VISSIM-CMEM platform. Comparative analysis results showed that proposed scheme can outperform original scheme in the aspects of reducing emission and passenger delay and an average reduction of 25.0% on transit emission and relative decrease in overall traffic emission can be achieved.