CMF / CRF Details

CMF ID: 10198

Change unpaved shoulder width from X to Y (in meters)

Description: Change unpaved shoulder width from X meters to Y meters

Prior Condition: Unpaved shoulder width of X meters, where X is less than 0.9 meters

Category: Shoulder treatments

Study: The influence of shoulder characteristics on the safety level of two-lane roads: A case-study, Gitelman et al., 2019

Star Quality Rating: 2 Stars   [View score details]
Rating Points Total: 70
Crash Modification Factor (CMF)
Value: Equation
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value: Equation
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type: All
Crash Severity: K (fatal),A (serious injury)
Roadway Types: Not specified
Street Type:
Minimum Number of Lanes: 2
Maximum Number of Lanes: 2
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather: Not specified
Road Division Type: Undivided
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
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: 2008 to 2010
Country: Israel
Type of Methodology Used: Case-control
Sample Size (sites): 2010 sites
Sample Size (site-years): 6030 site-years
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-07-2019
Comments: This applies when the existing unpaved shoulder width (X) is less than 2.25 meters and the proposed unpaved shoulder width (Y) is greater than or equal to 2.25 meters.