CMF / CRF Details

CMF ID: 10229

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: 3 Stars   [View score details]
Rating Points Total: 105
Crash Modification Factor (CMF)
Value: 1.25
Adjusted Standard Error:
Unadjusted Standard Error: 0.1
Crash Reduction Factor (CRF)
Value: -25   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 10
Crash Type: Vehicle/bicycle
Crash Severity: All
Roadway Types: Not specified
Number of Lanes: 6
Road Division Type: Divided by Median
Speed Limit: 40-55 MPH
Area Type: Urban
Traffic Volume: Minimum of 8000 to Maximum of 98500 Annual Average Daily Traffic (AADT)
Average Traffic Volume: 42703 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: 7
Sample Size (crashes): 1283 crashes
Sample Size (miles): 783 miles
Sample Size (mile-years): 3132 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 six-lane divided segments. Applicable for 10 and 11 foot lanes.