CMF / CRF Details

CMF ID: 8988

Provide 2-ft paved shoulders (both sides)

Description: Provide 2-ft paved shoulders on both sides of 2-lane rural roads

Prior Condition: No Prior Condition(s)

Category: Shoulder treatments

Study: Estimating Crash Modification Factors Using Cross-Sectional and Case-Control Methods for Rumble Strips and Paved Shoulders, Galgamuwa and Dissanayake, 2017

Star Quality Rating: 3 Stars   [View score details]
Rating Points Total: 105
Crash Modification Factor (CMF)
Value: 0.88
Adjusted Standard Error:
Unadjusted Standard Error: 0.019
Crash Reduction Factor (CRF)
Value: 12   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 1.9
Crash Type: Head on,Run off road,Sideswipe
Crash Severity: All
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: Minimum of 30 to Maximum of 15900 Annual Average Daily Traffic (AADT)
Average Traffic Volume: 1596 Annual Average Daily Traffic (AADT)
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: 2009 to 2014
State: KS
Country: USA
Type of Methodology Used: Regression cross-section
Sample Size (crashes): 8487 crashes
Sample Size (sites): 22061 sites
Sample Size (miles): 9027 miles
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Nov-17-2017
Comments: Tangent segments;Lane departure crashes