CMF / CRF Details

CMF ID: 8712

Widen shoulder


Prior Condition: Roadway with narrower shoulders

Category: Shoulder treatments

Study: Evaluation of Safety Effectiveness of Multiple Cross Sectional Features on Urban Arterials, Park and Abdel-Aty, 2016

Star Quality Rating: 3 Stars   [View score details]
Rating Points Total: 105
Crash Modification Factor (CMF)
Value: Equation
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type: All
Crash Severity: K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Principal Arterial Other
Street Type:
Minimum Number of Lanes: 2
Maximum Number of Lanes: 8
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather: Not specified
Road Division Type: All
Minimum Speed Limit: 20
Maximum Speed Limit: 65
Speed Unit: mph
Speed Limit Comment:
Area Type: Urban
Traffic Volume: Minimum of 1000 to Maximum of 94500 Annual Average Daily Traffic (AADT)
Average Traffic Volume: 31880 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: 2008 to 2012
State: FL
Country: USA
Type of Methodology Used: Regression cross-section
Sample Size (crashes): 50185 crashes
Sample Size (sites): 6420 sites
Sample Size (site-years): 32100 site-years
Sample Size (miles): 2514 miles
Sample Size (mile-years): 12570 mile-years
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Nov-06-2017
Comments: The CMF is for KABC crashes. CMF applies to urban arterials.