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SAFETY CONSIDERATIONS HOV FACILITIES AND MANAGED LANES IN HOUSTON

SAFETY CONSIDERATIONS HOV FACILITIES AND MANAGED LANES IN HOUSTON. Suhag Kansara Ned Levine, PhD Houston-Galveston Area Council TRB Conference on HOV and Managed Lanes Houston, TX April 18, 2005. Purpose. Document crashes on HOV lanes

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SAFETY CONSIDERATIONS HOV FACILITIES AND MANAGED LANES IN HOUSTON

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  1. SAFETY CONSIDERATIONSHOV FACILITIES AND MANAGED LANESIN HOUSTON Suhag Kansara Ned Levine, PhD Houston-Galveston Area Council TRB Conference on HOV and Managed Lanes Houston, TX April 18, 2005

  2. Purpose • Document crashes on HOV lanes • Compare safety of HOV lanes with General Purpose freeway lanes • Identify characteristics of HOV crashes

  3. Data sources • METRO HOV crash data 2001-2004 • DPS freeway crash data 1999-2001

  4. HOV Corridors in Houston Region

  5. HOV Crashes 2001-2004

  6. Crashes by time of day: 2001

  7. HOV Crashes 2001

  8. Crashes on HOV segments

  9. Crashes on Freeway segments

  10. Crash risk: HOV vs. Freeway lanes

  11. Multiple Crash Locations

  12. Multiple Crash Locations – large scale

  13. Hot-spot locations HOV lanes merging to freeway lanes

  14. Hot-spot locations Direct access ramps merging with HOV lanes from park and ride lots

  15. Junction related HOV crashes

  16. Hot-spot locations Design compromises in geometrical structure of HOV lane – shoulder width

  17. Contributing factors • Single vehicle crashes HOV facility 30% Freeway facility 24% • Speeding HOV facility 53% Freeway facility 56% • Following too close HOV facility 5% Freeway facility 3%

  18. Tentative conclusions • HOV lanes are safe • Design compromises can increase crash risk • Trade-off safety between barrier facilities vs. diamond lanes

  19. Future research • Compare barrier facilities with diamond lanes • Who is involved in the crashes • Disproportionate number of males • Disproportionate number of persons in their 30’s and 40’s • Do certain groups have more difficulty with barrier facility?

  20. For more information, see:http://www.h-gac.com/safety

  21. Thank You

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