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 mphNo shoulderOne streetlightVertical drop to the I&M Canal is 9 feetNormal 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 daytime5 are at night2 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