CMF / CRF Details

CMF ID: 6305

Widen paved shoulder from 4 ft to 8 ft

Description: Widening the existing paved shoulder

Prior Condition: 4 ft paved shoulder

Category: Shoulder treatments

Study: Safety Effects of Shoulder Paving for Rural and Urban Interstate, Mulitlane, and Two-Lane Highways, Li et al., 2013

 
Star Quality Rating: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.59
Adjusted Standard Error:
Unadjusted Standard Error: 0.01
Crash Reduction Factor (CRF)
Value: 41   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 1
Applicability
Crash Type: Fixed object,Head on,Run off road,Sideswipe
Crash Severity: O (property damage only)
Roadway Types: Not specified
Number of Lanes: 2
Road Division Type:
Speed Limit:
Area Type: Rural
Traffic Volume:
Average Traffic Volume:
Time of Day: All
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:
Traffic Control:
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used: 2000 to 2006
Municipality:
State: IL
Country: USA
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Mar-11-2015
Comments: Crash type is "Run-off-road right, then head-on and sideswiped with a vehicle in the opposite direction; Run-off-road right, then sideswiped with a vehicle in the same direction of multilane highways; Run-off-road right, then collided with fixed object on the right; Run-off-road right, then collided with fixed object on the left; Run-off-road right, then overturned in road or roadside involving single vehicle; and Run-off-road right, then overturned in road or roadside involving multiple vehicles"