6-1 LOW COST SAFETY IMPROVEMENTS Practitioner Workshop Exercise IX – Session #6

6-2 Exercise Learning Objectives:  Analyze traffic crash patterns and other engineering information  Select appropriate low cost safety and engineering countermeasures

6-3 Exercise IX – Location A: Run-off-the- Road Crashes on Curve  Speed limit is 35 mph  4,500 ADT  No shoulder  One streetlight  Vertical drop to the I&M Canal is 9 feet  Normal cross slope for outside lane

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

6-5 Exercise IX – Location A:  What Low Cost Safety Countermeasures (that you have learned about today) would you consider?  What is the safety effect of each?

6-6 Exercise IX – Location B: Left Turn Crashes into Gas Station Driveway near major intersection

6-7 Exercise IX – Location B: Left Turn Crashes into Gas Station Driveway View to the west of Diehl Road

6-8 Exercise IX – Location B: Left Turn Crashes into Gas Station Driveway Mobil Gas Station White Hen Convenience Store Driveways SW Quadrant

6-9 Exercise IX – Location B: 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

6-10 Exercise IX – Location B: Left Turn Crashes into Gas Station Driveway – Substantive Safety Performance  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

6-11 Exercise IX – Location B: 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 low cost safety countermeasures would you consider? What is the safety effect of each?

6-12 Questions? Exercise IX