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LOW COST SAFETY IMPROVEMENTS

LOW COST SAFETY IMPROVEMENTS. Practitioner Workshop Exercise – Part A – Session #6. Exercise. Learning Objectives: Analyze traffic crash patterns and other engineering information Select appropriate low cost safety and engineering countermeasures. Exercise. Exercise A-1:

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LOW COST SAFETY IMPROVEMENTS

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  1. LOW COST SAFETY IMPROVEMENTS Practitioner Workshop Exercise – Part A – Session #6

  2. Exercise Learning Objectives: • Analyze traffic crash patterns and other engineering information • Select appropriate low cost safety and engineering countermeasures

  3. Exercise Exercise A-1: Run-off-the- Road Crashes on Curve Speed limit is 35 mph No shoulder One streetlight Vertical drop to the I&M Canal is 9 feet Normal cross slope for outside lane

  4. Exercise Exercise A-1: Run-off-the- Road Crashes on Curve 6 Run-Off-The-Road Crashes in 3 years – 1 is daytime 5 are at night 2 involved vehicles in the canal

  5. Exercise What are your Ideas to Improve Safety on this Road?

  6. Exercise Exercise A-1: Run-off-the- Road Crashes on Curve • Add Super Elevation to • outside lane • Add Advance Curve Warning Sign with Advisory Speed • Add Chevrons • Upgrade Guardrail + End Treatment • Upgrade lighting and move to inside of curve

  7. Exercise Exercise A-2: Left Turn Crashes into Gas Station Driveway *NCHRP 500, Strategy 17.1 B11- Restrict or Eliminate Turning Maneuvers

  8. Exercise Exercise A-2: Left Turn Crashes into Gas Station Driveway View to the west of Diehl Road

  9. Exercise Exercise A-2: Left Turn Crashes into Gas Station Driveway Mobil Gas Station SW Quadrant White Hen Convenience Store Driveways

  10. Exercise Exercise A-2: Left Turn Crashes into Gas Station Driveway • Mobil Gas Station on southwest quadrant of major intersection of state marked route and major arterial street • State route is 4-lane (12’ lanes curb and gutter) with 12’ left turn lanes at 48,000 ADT at 40 mph and raised concrete median fronting gas station • Major arterial street is 5-lane (12’ lanes) with no median at 26,000 ADT at 40 mph • White Hen convenience store to south of gas station has cross access with gas station

  11. Exercise Exercise A-2: Left Turn Crashes into Gas Station Driveway • 19 crashes of westbound left turning vehicles with eastbound through vehicles in last 12 months at Mobil driveway 60 feet west of west curb line of state marked route • Additional info: Manager of White Hen is a friend of the Mayor; Councilman is a senior Officer for an Oil Company

  12. Exercise Exercise A-2: Left Turn Crashes into Gas Station Driveway • Left turns from westbound Diehl Road into Gas Station Driveway were Prohibited • Sign was posted (near right and far right position) as well as Do NOT ENTER • Results were 6 left turn crashes in 3 months. What are your Ideas to Improve Safety for this Intersection?

  13. Exercise Exercise A-2: Left Turn Crashes into Gas Station Driveway • Super-duxs Traffic Pylons installed on Centerline on 5 foot centers

  14. Exercise Exercise A-2: Left Turn Crashes into Gas Station Driveway • Super-duxs Traffic Pylons installed on Centerline on 5 foot centers

  15. Exercise Questions?

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