CMF / CRF Details

CMF ID: 5413

Convert lane width from 12 ft to 11 ft, with a total shoulder of X ft

Description: The cmf is for a combination of lane width and shoulder width. The total shoulder width includes paved and unpaved shoulder width and X is in ft

Prior Condition: 12 ft lane width with 6 ft shoulder width

Category: Roadway

Study: Safety Effects of Cross Section Design on Urban and Suburban Roads, Le and Porter, 2012

Star Quality Rating: 3 Stars   [View score details]
Rating Points Total: 85
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:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather: Not specified
Road Division Type: All
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type: Urban and suburban
Traffic Volume: Minimum of 1183 to Maximum of 47067 Annual Average Daily Traffic (AADT)
Average Traffic Volume: 11317 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: 2007 to 2009
State: IL
Country: USA
Type of Methodology Used: Regression cross-section
Sample Size (crashes): 2004 crashes
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Jan-09-2014
Comments: The function includes an interaction between lane width and shoulder width