1 / 17

ARROW

Tim Tharpe TEBM – Traffic Engineering Division of Traffic Operations. FLASHING. ARROW. YELLOW. Flashing Yellow Arrow. History What Is It? KYTC/Louisville Metro/LFUCG Analysis The Future. Flashing Yellow Arrow. History

gavan
Download Presentation

ARROW

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Tim Tharpe TEBM – Traffic Engineering Division of Traffic Operations FLASHING ARROW YELLOW

  2. Flashing Yellow Arrow • History • What Is It? • KYTC/Louisville Metro/LFUCG Analysis • The Future

  3. Flashing Yellow Arrow History • In 1990, NCHRP initiated evaluation of protected/permitted left-turn signal displays • Study lasted 7 years, considered many alternatives • In 2003, NCHRP Report 493 published • FYA performed the best • Intuitive • Time-of-day, “yellow trap”, additional signal head • Interim approval granted by FHWA on March 20, 2006 • Further experimentation • Added to 2009 MUTCD

  4. Flashing Yellow Arrow History • First installation of FYA in Kentucky: • Jefferson County • KY 1747 (Hurstbourne Lane) @ Dorsey Lane • Installed November 9, 2009 • Others soon followed throughout the state

  5. Traditional 5-Section “Doghouse” Head Arrangement

  6. What Is It?

  7. What Is It?

  8. Flashing Yellow Arrow KYTC Analysis • Comprehensive crash review • 50 intersections with FYA as of April 1, 2011 (40 reviewed) • Before and After comparison • 100 days • All crashes (primary focus on left-turn, angle, head-on, sideswipe)

  9. Flashing Yellow Arrow KYTC Analysis • Conclusions: • FYA did not appear to be a factor in crashes • Overall crashes increased 22.13% • Left-turn crashes decreased 30% • Changes were generally +/- one crash • Overall injuries decreased 2.56%

  10. Flashing Yellow Arrow Louisville Metro • KY 1447 (Westport Road) @ I-265 On-Ramp • Protected/Permitted • T-intersection • High volumes • Significant left-turn crash history • Less efficient protected-only not desired

  11. Flashing Yellow Arrow

  12. Flashing Yellow Arrow Louisville Metro • FYA installed August 20, 2011 • No other countermeasures performed • Left-turn crashes before FYA installation: • 19 (January 2008 – August 20, 2011) • 5.2 left-turn crashes per year • Left-turn crashes after FYA installation: • 1 (August 20, 2011 to October 25, 2012) • Preferred treatment

  13. Flashing Yellow Arrow

  14. Flashing Yellow Arrow Lexington Fayette Urban County Government (LFUCG) • FYA installed at numerous locations throughout Lexington • Before/After study • 18% reduction in all crashes • 18% reduction in left-turn crashes • 22% reduction in left-turn injury crashes • Preferred treatment

  15. Flashing Yellow Arrow Where Do We Go From Here? • Approval Process: • Preferred treatment for Protected/Permitted • No longer requires Central Office approval* • *Doghouse to 4-section FYA (with green) – OK • *Permitted left to 3-section FYA (no green) – OK • Provide Central Office with a revised Traffic Signal Checklist including date/time of installation • Protected-Only to FYA or other phase change • Central Office Approval

  16. Questions Questions? Questions

More Related