Optimal variable speed-limit control under abnormal traffic conditions

Yu-Chiun Chiou*, Yen Fei Huang, Po Cheng Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Application of variable speed-limit (VSL) control has become promising in managing incidents in the context of intelligent highway systems, wherein advanced VSL signs are densely placed along the roadways. This paper aims to develop a genetic-fuzzy-logic- controller (GFLC)-based VSL control model with an objective function to enhance both safety and throughput efficiency at incident sites. In order to evaluate the performance of learned logic rules and tuned membership function, a revised cell transmission model is proposed, which is validated with field traffic data. The results indicate that the proposed VSL control model can effectively curtail crash likelihood while only slightly decreasing the throughput efficiency under different tested incident cases. It suggests that our proposed GFLC-based VSL control model is promising for practical applications.

Original languageEnglish
Pages (from-to)299-308
Number of pages10
JournalJournal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A/Chung-kuo Kung Ch'eng Hsuch K'an
Issue number3
StatePublished - 1 Apr 2012


  • Cell transmission model
  • Genetic fuzzy logic controller
  • Variable speed-limit control


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