A Data Driven Safety Assessment of Various Left Turn Phasing Strategies

PI: Ali Hajbabaie (WSU), ali.hajbabaie@wsu.edu

AMOUNT & MATCH: $40,000 from PacTrans; $40,000 from WSDOT

DATES: 12/15/2016 – 1/31/2018

STATUS: Active

CATEGORIES: Safety, Operations, Intersections

RESEARCH PROJECT HOT SHEET: download

UTC PROJECT DOCUMENTATION:

FINAL PROJECT REPORT: will be available once completed

DESCRIPTION: This research will use a data-driven methodology to assess the safety of the aforementioned signalization strategies. The results of this research will help decision makers to select a more suitable signal phasing plan/display under various operational conditions. Specific objectives are:

  1. Compare the safety of protected left turns to protected-permissive left turns with FYA,
  2. Compare the safety of doghouse displays to four section vertical displays with Flashing Yellow Arrow (FYA), and
  3. Assess the safety of including FYA phases in protected-permissive left turns at different times of the day to identify if it creates driver confusion.
DELIVERABLE DUE DATE DATE RECEIVED
Research Project Progress Report #1 April 10, 2017  April 14, 2017
Research Project Progress Report #2 October 10, 2017  October 10, 2017
No Cost Extension Request November 30, 2017
Draft Report November 30,2017
Final Project Report January 31, 2018