Safety-Related Guidelines for Time-of-Day Changes in Left-Turn Phasing

The goal of this research was to develop safety-related guidelines for time-of-day use of permissive left-turn phasing that could be implemented with flashing yellow arrows. This effort required describing the variation in left-turn crash risk throughout a representative day and was accomplished by developing statistical models that related the hourly risk on an approach to left-turn demand, opposing traffic volume, and a classification of the approach with respect to operational and geometric features. The models were then embedded in a spreadsheet tool that allowed signal operators to enter—for a candidate intersection approach—a turning movement count and a classification of the approach according to speed limit, left-turn protection, and sight distance availability. The user receives a prediction of how the risk of left-turn crash occurrence varies throughout the day, relative to a user-specified reference condition.

• Record URL:
  https://doi.org/10.3141/2557-10
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780309369909
• Authors:
  • Davis, Gary A
  • Moshtagh, Vahid
  • Hourdos, John
• Publication Date: 2016

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 100–107
• Monograph Title: Traffic Signal Systems, Volume 1
• Serial:
  • Transportation Research Record: Journal of the Transportation Research Board
  • Issue Number: 2557
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Flashing traffic signals; Left turns; Periods of the day; Risk assessment; Sight distance; Traffic volume; Yellow interval (Traffic signal cycle)
• Subject Areas: Highways; Operations and Traffic Management; Safety and Human Factors; I82: Accidents and Transport Infrastructure; I83: Accidents and the Human Factor; I85: Safety Devices used in Transport Infrastructure;

Filing Info

• Accession Number: 01590265
• Record Type: Publication
• ISBN: 9780309369909
• Report/Paper Numbers: 16-3727
• Files: PRP, TRIS, TRB, ATRI
• Created Date: Feb 16 2016 2:35PM