CMF / CRF Details

CMF ID: 2995

Increase roadway width (lanes and shoulders in meters)

Description: Increase the roadway width (i.e., lanes plus shoulders) in meters

Prior Condition: rural two-lane road with mountainous terrain with a roadway width of X (meters)

Category: Roadway

Study: Safety Performance Functions for Low-Volume Roads, Acqua and Russo, 2010

Star Quality Rating: 3 Stars   [View score details]
Rating Points Total: 90
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),B (minor injury),C (possible 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: 35
Maximum Speed Limit: 35
Speed Unit: mph
Speed Limit Comment:
Area Type: Rural
Traffic Volume: Maximum of 1000 Average Daily Traffic (ADT)
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: 2003 to 2005
Country: Italy
Type of Methodology Used: Regression cross-section
Sample Size (crashes): 49 crashes
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Jul-15-2011