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.


  • English


  • 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

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