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

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

6-Answers-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

6-Answers-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

6-Answers-5 Exercise What are your Ideas to Improve Safety on this Road?

6-Answers-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

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

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

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

6-Answers-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

6-Answers-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

6-Answers-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?

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

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

6-Answers-15 Questions? Exercise