CMF / CRF Details

CMF ID: 10738

Install bicycle lanes


Prior Condition:  No Bicycle Lane

Category: Bicyclists

Study: Development of Crash Modification Factors for Bicycle Lane Additions While Reducing Lane and Shoulder Widths, , 2021

Star Quality Rating:4 Stars  [View score details]
Rating Points Total:115
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.261
Crash Reduction Factor (CRF)
Value:49  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:26.1
Crash Type:All
Crash Severity:All
Roadway Types:All
Street Type:
Minimum Number of Lanes:4
Maximum Number of Lanes:4
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Undivided
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Urban
Traffic Volume:Minimum of 10 to Maximum of 92462 Annual Average Daily Traffic (AADT)
Average Traffic Volume:13001 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:2015 to 2018
Type of Methodology Used:Regression cross-section
Sample Size (sites):372 sites
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Feb 25, 2021
Comments:This CMF is for bicycle lane addition resulting in reduced shoulder or lane width and 20 percent increase in average daily bicycle traffic (ADBT). The base condition was 11-ft lanes, no shoulder, no median, and four-lane urban collector or local road.