Online turning proportion estimation in real-time traffic-adaptive signal control

Pitu B. Mirchandani, Steven A. Nobe, Wenji W. Wu

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


An online method for traffic-adaptive turning proportion estimation for intersections based on a least-squares minimization approach is presented. It assumes that entering-vehicle lane counts and exiting-vehicle counts during every traffic signal phase and in each direction of an intersection are available. Estimations based on field data in the last three cycles (approximately 5 min) are compared with actual values. This method of turning proportion estimation was also implemented within RHODES, a real-time traffic-adaptive signal control system developed in the Advanced Transportation and Logistics: Algorithm and Systems Research Center at the University of Arizona. The resulting system was evaluated in a laboratory using CORSIM, a microscopic traffic simulation computer package. Performance of RHODES improves when the online traffic-adaptive turning proportions are used instead of constant turning proportions.

Original languageEnglish (US)
Pages (from-to)80-86
Number of pages7
JournalTransportation Research Record
Issue number1748
StatePublished - Jan 1 2001
Externally publishedYes

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Mechanical Engineering


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