Implementing phase rotation in a person-based signal timing optimization framework

Zhengyao Yu, Vikash V. Gayah, Eleni Christofa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations


Person-based traffic signal timing optimization frameworks have recently been proposed to minimize total passenger delay at intersections. These traffic-responsive frameworks implicitly prioritize transit vehicles over cars due to their higher passenger occupancies while considering conflicts that might exist between transit vehicles arriving from conflicting approaches. However, previous person-based signal timing optimizations consider only fixed phase sequences, which limits their flexibility. This paper extends previously developed algorithms to consider phase rotation in which phase sequences may change within each cycle. The phase rotation is directly incorporated in the mathematical programming framework, but could also be accommodated using an enumeration approach for computational efficiency. The proposed signal timing optimization is tested using numerical simulations of an intersection in State College, PA. The results reveal that phase rotation can reduce overall passenger delay through significantly cutting down bus passenger delay while slightly increasing car passenger delay. However, the performance is sensitive to the assumption made in optimization about phase sequence in future cycles. Assuming a background sequence, rather than an optimized sequence in the current cycle, for future generally results in less frequent phase rotation actions. Such a practice can better maintain a pre-assigned background phase sequence but limits the reduction in passenger delays at the intersection.

Original languageEnglish (US)
Title of host publication2018 IEEE Intelligent Transportation Systems Conference, ITSC 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Electronic)9781728103235
StatePublished - Dec 7 2018
Event21st IEEE International Conference on Intelligent Transportation Systems, ITSC 2018 - Maui, United States
Duration: Nov 4 2018Nov 7 2018

Publication series

NameIEEE Conference on Intelligent Transportation Systems, Proceedings, ITSC


Other21st IEEE International Conference on Intelligent Transportation Systems, ITSC 2018
Country/TerritoryUnited States

All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Mechanical Engineering
  • Computer Science Applications


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