Protected-permissive left turn phasing with flashing yellow arrow signal: Study of red intervals for an effective phase transition

Muqtasid Mahbub, Min Wook Kang, Joyoung Lee

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Protected-permissive left turn (PPLT) phasing has been popular and widely used in many urban intersections in North America because of its operational benefits. A significant number of intersections have recently been upgraded with four-section signal heads with flashing yellow arrow (FYA) indication for an effective protected-permissive left turn operation. The present study seeks to find appropriate length of two red intervals whose roles are important, but different during the transition period of FYA-PPLT phasing. One is a red interval for delayed-start of permissive left turn movements; the other is additional red interval for delayed-start of opposing through movements. Micro-traffic simulation and conflict analysis are explored to assess the effects of the red intervals on intersection efficiency and safety. A useful reference, which describes the balanced length of the two red intervals under varying traffic levels, is developed as a result.

Original languageEnglish (US)
Pages (from-to)732-741
Number of pages10
JournalCanadian Journal of Civil Engineering
Volume46
Issue number8
DOIs
StatePublished - Jan 1 2019

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Environmental Science(all)

Keywords

  • Conflict analysis
  • Flashing yellow arrow
  • Micro-traffic simulation
  • Protected-permissive left turn
  • Red interval
  • SSAM
  • Transition period
  • VISSIM

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