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Discrete Dynamics in Nature and Society
Volume 2012, Article ID 907639, 13 pages
Research Article

Offset Optimization Based on Queue Length Constraint for Saturated Arterial Intersections

1Transportation College, Jilin University, Changchun 130022, China
2Civil Engineering and Architecture College, Zhejiang University, Hangzhou 310058, China

Received 17 August 2012; Revised 27 November 2012; Accepted 4 December 2012

Academic Editor: Wuhong Wang

Copyright © 2012 Xianmin Song 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.


Offset optimization is of critical importance to the traffic control system, especially when spillovers appear. In order to avoid vehicle queue spillovers, an arterial offset optimization model was presented in saturated arterial intersections based on minimizing the queue length over the whole duration of the saturated traffic environment. The paper uses the shockwave theory to analyze the queue evolution process of the intersection approach under the saturated traffic environment. Then through establishing and analyzing a function relationship between offset and the maximum queue length per cycle, a mapping model of offset and maximum queue length was established in the saturated condition. The validity and sensitivity of this model were tested by the VISSIM simulation environment. Finally, results showed that when volumes ratios are 0.525–0.6, adjusting offset reasonably under the saturated condition could decrease the queue length and effectively improve the vehicle operating efficiency.