CMF / CRF Details

CMF ID: 10219

Reduce lane width from 12 ft to less than 12 ft

Description: Reduce average lane width from at least 12 ft wide to less than 12 ft wide

Prior Condition: Average lane width is 12 ft

Category: Roadway

Study: Estimation of bicycle crash modification factors (CMFs) on urban facilities using zero inflated negative binomial models, Raihan et al., 2019

Star Quality Rating: 2 Stars   [View score details]
Rating Points Total: 65
Crash Modification Factor (CMF)
Value: 1.72
Adjusted Standard Error:
Unadjusted Standard Error: 0.58
Crash Reduction Factor (CRF)
Value: -72   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 58
Crash Type: Vehicle/bicycle
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: Divided by Median
Minimum Speed Limit: 30
Maximum Speed Limit: 55
Speed Unit: mph
Speed Limit Comment:
Area Type: Urban
Traffic Volume: Minimum of 1300 to Maximum of 42000 Annual Average Daily Traffic (AADT)
Average Traffic Volume: 12017 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: 2011 to 2014
State: FL
Country: USA
Type of Methodology Used: Regression cross-section
Sample Size (crashes): 178 crashes
Sample Size (miles): 399 miles
Sample Size (mile-years): 1596 mile-years
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-07-2019
Comments: This CMF applies to vehicle/bicycle crashes on urban two-lane divided segments.