Controlled optimization of phases at an intersection

Suvrajeet Sen, K. Larry Head

Research output: Contribution to journalArticlepeer-review

211 Scopus citations


This paper presents a general purpose algorithm for real-time traffic control at an intersection. Our methodology, based on dynamic programming, allows optimization of a variety of perfor-mance indices such as delay, stops and queue lengths. Furthermore, optimal phase sequencing is a direct by-product of this new approach. These features make the new methodology a powerful tool for intersection control. We demonstrate the usefulness of the approach by a simulation experiment in which our intersection control algorithm is interfaced with a well established simulation package called TRAF-NETSIM. Our study compares the controlled optimization of phases methodology with fully-actuated as well as semi-actuated control. We show that consistent reductions in delay may be possible by adopting the new algorithm.

Original languageEnglish (US)
Pages (from-to)5-17
Number of pages13
JournalTransportation Science
Issue number1
StatePublished - Feb 1997

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Transportation


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