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

Document Type

Article

Publication Date

1-1-2019

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.

Identifier

85073908432 (Scopus)

Publication Title

Canadian Journal of Civil Engineering

External Full Text Location

https://doi.org/10.1139/cjce-2018-0381

e-ISSN

12086029

ISSN

03151468

First Page

732

Last Page

741

Issue

8

Volume

46

Fund Ref

University of South Alabama

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