SAFETY CONSIDERATIONS HOV FACILITIES AND MANAGED LANES IN HOUSTON Suhag Kansara Ned Levine, PhD Houston-Galveston Area Council TRB Conference on HOV and.

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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 Compare safety of HOV lanes with General Purpose freeway lanes Identify characteristics of HOV crashes

Data sources METRO HOV crash data DPS freeway crash data

HOV Corridors in Houston Region

HOV Crashes

Crashes by time of day: 2001

HOV Crashes 2001

Crashes on HOV segments

Crashes on Freeway segments

Crash risk: HOV vs. Freeway lanes

Multiple Crash Locations

Multiple Crash Locations – large scale

Hot-spot locations HOV lanes merging to freeway lanes

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

Junction related HOV crashes

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

Contributing factors Single vehicle crashes HOV facility30% Freeway facility24% Speeding HOV facility53% Freeway facility56% Following too close HOV facility5% Freeway facility3%

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

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

For more information, see:

Thank You