CMF / CRF Details

CMF ID: 10223

Change lane width from X to Y (in feet)

Description: Change lane width on rural two-lane highways from X to Y (in feet)

Prior Condition: Average lane width of X feet

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: Equation
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value: Equation
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type: Vehicle/bicycle
Crash Severity: All
Roadway Types: Not specified
Number of Lanes: 4
Road Division Type: Divided by Median
Speed Limit: 35-60 MPH
Area Type: Urban
Traffic Volume: Minimum of 2300 to Maximum of 120000 Annual Average Daily Traffic (AADT)
Average Traffic Volume: 24826 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): 1174 crashes
Sample Size (miles): 1573 miles
Sample Size (mile-years): 6292 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 four-lane divided segments with an average lane width from 10 to 12 feet.