CMF / CRF Details

CMF ID: 2942

Replacement of traditional intersection with roundabout with separated cycle path

Description: Installation of a roundabout with a separated cycle path in place of a traditional (signalized or unsignalized) intersection. Study roundabouts were split between priority to bicyclists and no priority to bicyclists in the cycle lanes.

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:0.83
Adjusted Standard Error:
Unadjusted Standard Error:0.171
Crash Reduction Factor (CRF)
Value:17  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:17.1
Applicability
Crash Type:Vehicle/bicycle
Crash Severity:All
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:Not specified
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
Municipality:
State:notusa
Country:Belgium
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Sample Size (sites):38 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.