CMF / CRF Details

CMF ID: 9280

Conversion of intersection into single-lane roundabout

Description: Conversion of intersection into single-lane roundabout

Prior Condition:  signalized, stop-controlled, yield-controlled and non-controlled intersections

Category: Intersection geometry

Study: Safe roundabouts for cyclists, Jensen, S. U., 2017

 
Star Quality Rating:2 Stars  [View score details]
Rating Points Total:50
Crash Modification Factor (CMF)
Value:0.85
Adjusted Standard Error:
Unadjusted Standard Error:0.105
Crash Reduction Factor (CRF)
Value:15  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:10.5
Applicability
Crash Type:All
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:40
Maximum Speed Limit:130
Speed Unit:km/h
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:No values chosen.
Traffic Control:Not specified
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:
Municipality:
State:notusa
Country:Denmark
Type of Methodology Used:Before/after using comparison group
Sample Size (crashes):106 crashes after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Jun 17, 2018
Comments:Central island height=0 to 1.9mCentral island diameter=20m-39.9m