CMF / CRF Details

CMF ID: 2941

Replacement of traditional intersection with roundabout with cycle lanes

Description: Installation of a roundabout with cycle lanes at a traditional (signalized or unsignalized) intersection. Cycle lanes in this study included: -lines + barrier (predominately) -line + no barrier (predominately) -no line + barrier -no line + no barrier

Prior Condition: Traditional signalized or unsignalized intersection

Category: Bicyclists

Study: Injury crashes with bicyclists at roundabouts: influence of some location characteristics and the design of cycle facilities, Daniels et al., 2009

Star Quality Rating: 2 Stars   [View score details]
Rating Points Total: 40
Crash Modification Factor (CMF)
Value: 1.37
Adjusted Standard Error:
Unadjusted Standard Error: 0.398
Crash Reduction Factor (CRF)
Value: -37   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 39.8
Crash Type: Vehicle/bicycle
Crash Severity: K (fatal),A (serious injury)
Roadway Types: Not Specified
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather: Not specified
Road Division Type: All
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type: Urban
Traffic Volume:
Average Traffic Volume:
Time of Day: All
If countermeasure is intersection-based
Intersection Type: Roadway/roadway (not interchange related)
Intersection Geometry: 3-leg,4-leg
Traffic Control: Roundabout
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used: 1991 to 2001
Country: Belgium
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Sample Size (sites): 40 sites after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Mar-21-2011
Comments: The number of crashes in the after period were not reported in this study, however, they have been recorded as 300 to give 10 points as a beneift of doubt for one or more of the following: (1) number of miles/sites in the reference/treatment group, (2) number of crashes in the references/treatment group, (3) reporting AADTs for the aggregate dataset but not for the disaggragate dataset used for CMF development.