6-answers-1 low cost safety improvements practitioner workshop exercise – part a – session #6
TRANSCRIPT
6-Answers-1
LOW COST SAFETY IMPROVEMENTS
Practitioner Workshop
Exercise – Part A
– Session #6
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Exercise
Learning Objectives:
Analyze traffic crash patterns and other engineering information
Select appropriate low cost safety and engineering countermeasures
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Exercise
Exercise A-1:Run-off-the-
Road Crashes on Curve
Speed limit is 35 mphNo shoulderOne streetlightVertical drop to the I&M Canal is 9 feetNormal cross slope for outside lane
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Exercise
Exercise A-1:Run-off-the-
Road Crashes on Curve
6 Run-Off-The-Road Crashes in 3 years –1 is daytime5 are at night2 involved vehicles in the canal
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Exercise
What are your Ideas to Improve Safety on this Road?
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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
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Exercise
Exercise A-2:Left Turn
Crashes into Gas Station Driveway
*NCHRP 500, Strategy 17.1 B11- Restrict or Eliminate Turning Maneuvers
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Exercise
Exercise A-2:
Left Turn Crashes into Gas Station Driveway
View to the west of Diehl Road
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Exercise
Exercise A-2:Left Turn Crashes into Gas Station Driveway
Mobil Gas Station
White Hen Convenience Store
Driveways
SW Quadrant
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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
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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
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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?
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Exercise
Exercise A-2:Left Turn Crashes into Gas Station
Driveway Super-duxs
Traffic Pylons installed on Centerline on 5 foot centers
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Exercise
Exercise A-2:Left Turn Crashes into Gas Station
Driveway Super-duxs
Traffic Pylons installed on Centerline on 5 foot centers
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Questions?
Exercise