CMF / CRF Details

CMF ID: 8287

Install separated bicycle lane

Description: Bike lanes separated from motorized traffic by different types of barriers and/or parking lane configurations

Prior Condition: No separate bicycle lane

Category: Bicyclists

Study: Separated Bike Lane Crash Analysis, Rothenberg et al., 2016

Star Quality Rating: 2 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.963
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value: 3.7   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type: All
Crash Severity: All
Roadway Types: Not specified
Number of Lanes:
Road Division Type:
Speed Limit:
Area Type: Not specified
Traffic Volume:
Average Traffic Volume:
Time of Day: Not specified
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:
State: CA, DC, FL, IL, MT, NY, OR, TX
Country: USA
Type of Methodology Used: Simple before/after
Sample Size (sites): 30 sites before, 30 sites after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Jan-17-2017
Comments: CMF Applies to average total crashes when no bike lane was provided in the before period. Study sites were located in Texas, Illinois, Oregon, California, Montana, New York, Florida, and Washington DC; however, it is unclear which States were used for the development of this CMF.


The information contained in the Crash Modification Factors (CMF) Clearinghouse is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in the CMF Clearinghouse. The information contained in the CMF Clearinghouse does not constitute a standard, specification, or regulation, nor is it a substitute for sound engineering judgment.