Safety Evaluation of Flashing Yellow Left-Turn Arrows in Missouri

The Missouri Department of Transportation (MoDOT) has been utilizing flashing yellow arrows for left turns on state routes since 2006 after receiving interim approval from the Federal Highway Administration (FHWA). MoDOT has been installing these signal indications at new signalized intersections where a permissive left turn is needed and updating current locations with a circular green ball for permissive movements to the flashing yellow arrow across the state. For various reasons, there have been questions whether the change to the flashing yellow arrow for left turns has actually led to an increase in crashes over recent years. Given that there is sufficient crash data at this point, this project will provide a valuable Missouri-focused study on the before and after safety of flashing yellow left-turn arrows for left turns.

Language

• English

Project

• Status: Active
• Funding: $174,957
• Sponsor Organizations:

  Missouri Department of Transportation

  1617 Missouri Boulevard
  P.O. Box 270
  Jefferson City, MO  United States  65102
• Project Managers:

  Hosey, Jenni

• Performing Organizations:

  Leidos

  11951 Freedom Drive
  Reston, Virginia  United States  20190
• Principal Investigators:

  Jones, Joe

• Start Date: 20210102
• Expected Completion Date: 20221231
• Actual Completion Date: 0

Subject/Index Terms

• TRT Terms: Arrows (Signals); Before and after studies; Crash rates; Evaluation and assessment; Flashing traffic signals; Left turns; Traffic safety; Yellow
• Geographic Terms: Missouri
• Subject Areas: Highways; Operations and Traffic Management; Safety and Human Factors;

Filing Info

• Accession Number: 01769429
• Record Type: Research project
• Source Agency: Missouri Department of Transportation
• Files: RIP, STATEDOT
• Created Date: Apr 14 2021 9:15AM