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Journal of Advanced Transportation
Volume 2017 (2017), Article ID 7670521, 12 pages
Research Article

Shortest-Way: An Improved Empirical Transition Method for Signal Coordination

1School of Traffic and Transportation Engineering, Dalian Jiaotong University, Dalian, Liaoning 116028, China
2School of Transportation and Logistics, Dalian University of Technology, Dalian, Liaoning 116024, China

Correspondence should be addressed to Hongfeng Xu

Received 18 October 2016; Accepted 7 February 2017; Published 20 March 2017

Academic Editor: Yue Liu

Copyright © 2017 Mingming Zheng 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.


Four fundamental insights into transition methods are provided from the perspective of traffic engineers. An improved empirical transition method (i.e., Shortest-way) is developed with the goal of reducing the time spent on offset correction and the offset deviations of the coordinated phases during the transition period. Shortest-way operates stepwise and can be activated to correct offset at the scheduled time to switch plans. The maximum amount of adjustment that can be made to a transition cycle length is calculated based on the timing parameters of active phases in the old and new plans. The problem of cycle length distribution is formulated as a nonlinear integer programming problem, aiming at minimizing the sum of the squares of the intersection offset deviations of all the transition cycles. The portion of the cycle length that can be allocated to each phase in a transition cycle is calculated based on its splits in the old and new plans and its potential contribution to the maximum amount of adjustment to the cycle length. The numerical experimental results proved the potential advantage of Shortest-way over CORSIM Shortway and justified the necessity for managing the time to switch plans at the intersection level.