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Journal of Advanced Transportation
Volume 2017, Article ID 4390630, 13 pages
Research Article

Variable Speed Limit Signs: Control and Setting Locations in Freeway Work Zones

College of Transportation, Jilin University, Changchun 130022, China

Correspondence should be addressed to Zeyang Cheng; nc.ude.ulj.sliam@41yzgnehc

Received 18 October 2016; Revised 4 January 2017; Accepted 9 March 2017; Published 12 April 2017

Academic Editor: Pasquale Candito

Copyright © 2017 Wei Wang and Zeyang Cheng. 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.


Variable Speed Limit Sign (VSLS) Systems enable speed limits to be changed dynamically in response to traffic conditions so that traffic incidents can be reduced significantly on freeway work zones. In this paper, we examined how many and where VSLS are to be placed and the speed limits to be set and proposed a bilevel programming model to perform this decision making operation. The appropriate speed limits and deployments of VSLS were got by case study, and they were analyzed by a simulation to prove the empirical features of traffic breakdown at freeway work zones. Then the results of model comparison and simulation evaluation illustrate that the proposed method outperforms existing models in terms of maximizing information benefit and minimizing average queue length, total delay, and total stop frequency on the freeway work zone.