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Safety on Kirby Drive: 1998-2001 PowerPoint Presentation
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Safety on Kirby Drive: 1998-2001

Safety on Kirby Drive: 1998-2001

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Safety on Kirby Drive: 1998-2001

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  1. Safety on Kirby Drive: 1998-2001 Ned Levine, PhD Houston-Galveston Area Council Houston, TX

  2. Kirby Drive Safety • Between 1998 and 2001: • 1225 serious crashes • 4 fatal • 29 incapacitating injuries • 640 less serious injuries Type of crashes 14 pedestrians 7 bicyclists 8 parked cars 78 fixed objects 1112 other motor vehicles

  3. Factors in Crashes (Regional Share) Contributing factors 34% speeding (39%) * 28% failure to yield (20%) * 15% failure to stop at light or stop sign (11%) * 13% running a red light (8%) 5% DUI (7%) * 3% improper turn (2%)

  4. Measure of Severity Serious # Serious crashes Crash Risk = ------------------------------------------------- 100 million vehicle miles traveled

  5. Serious Crash Risk Serious Crashes Per 100 Million VMT Kirby Drive 433 Urban principal arterials: Harris County 247 State of Texas 233

  6. From San Felipe to Bissonnet: 1998–2001Total Crashes = 565

  7. From San Felipe to Bissonnet: 1998–2001Mid-Block Crashes Block Total # of CrashesRight Angle Crashes San Felipe to Westheimer 4530 Westheimer to W. Alabama 359 W. Alabama to Richmond 6524 Richmond to US 59 NSR 5015 US 59 NSR to US 59 SSR 17 3 Westpark to Bissonnet 54 9 Total 266 90 Crashes at an angle constitute 34% of the total number of mid-block crashes

  8. From San Felipe to Bissonnet: 1998–2001 Intersection Crashes Intersection Total # of CrashesRight Angle Crashes San Felipe 22 9 Westheimer 21 5 W. Alabama 3315 Richmond 3011 US 59 NSR 4914 US 59 SSR 3715 Westpark 4312 Bissonnet 6414 Total 299 95 Crashes at an angle constitute 32% of the total number of crashes at intersections

  9. Types of Median Treatments on Urban Arterials Two-way Left Turn Lanes v. Raised Medians

  10. Current Conclusions • Raised medians are safer for both vehicles and pedestrians • At low to moderate volumes: • Two-way left turn lanes improve safety • At high volumes and with many driveways: Two-way left turn lanes encourage many crashes • Businesses and drivers don’t like raised medians • No evidence that raised medians hurt businesses

  11. Research Results • In Des Moines, IA, adding raised median • decreased crashes by 50% • In central New Jersey, raised median • decreased pedestrian crashes by 28% • At 1000 paired intersections in 30 cities: • At higher volumes, raised medians reduced pedestrian risk by 46% • Marked crosswalks were more dangerous at higher volumes

  12. Traffic Volumes on Kirby Dr • In 2000, H-GAC estimated 18,778 vehicles/day • In 2025, H-GAC forecasts 22,322 vehicles/day • This is an expected 19% increase in volume

  13. Impacts on Business • Three studies, two in Texas • College Station, McKinney, Longview, Wichita Falls, • Odessa, Houston, Port Arthur, Amarillo • 67% or more of businesses surveyed reported • no negative impacts after construction • Second Texas study reported 18% increase • in property values after construction of median

  14. Local Example FM 518