Evaluating the Safety Impacts of Flashing Yellow Permissive Left-Turn Indications in Massachusetts

The 2009 Edition of the Manual on Uniform Traffic Control Devices (MUTCD) introduced the Flashing Yellow Arrow (FYA) as a permissive left-turn indication. Massachusetts has since set out to implement this innovative traffic control device at intersections across the Commonwealth. A recent MassDOT retrofit project sought out to convert over 350 traditional steady green ball protected-permissive left-turn (PPLT) traffic signals to FYA protected-permissive operation. With the completion of the retrofit project in sight, this research initiative aims to investigate the safety impact of converting to the permissive left-turn FYA indication.

• Supplemental Notes:
  • Contract to a Performing Organization has not yet been awarded.

Project

• Status: Active
• Funding: $100,000
• Sponsor Organizations:

  Massachusetts Department of Transportation

  10 Park Plaza
  Boston, MA  United States  02116
• Start Date: 20191021
• Expected Completion Date: 0
• Actual Completion Date: 0

Subject/Index Terms

• TRT Terms: Evaluation and assessment; Flashing traffic signals; Highway safety; Left turns; Retrofitting; Yellow interval (Traffic signal cycle)
• Geographic Terms: Massachusetts
• Subject Areas: Highways; Operations and Traffic Management; Safety and Human Factors;

Filing Info

• Accession Number: 01719615
• Record Type: Research project
• Source Agency: Massachusetts Department of Transportation
• Files: RiP, STATEDOT
• Created Date: Oct 21 2019 3:07PM