CMF / CRF Details

CMF ID: 2943

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]
Crash Modification Factor (CMF)
Value: 1.42
Adjusted Standard Error:
Unadjusted Standard Error: 0.436
Crash Reduction Factor (CRF)
Value: -42   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 43.6
Applicability
Crash Type: Vehicle/bicycle
Crash Severity: K (fatal),A (serious injury)
Roadway Types: Not Specified
Number of Lanes:
Road Division Type: All
Speed Limit:
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:
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: