CMF / CRF Details

CMF ID: 9308

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: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 1.88
Adjusted Standard Error:
Unadjusted Standard Error: 0.446
Crash Reduction Factor (CRF)
Value: -88   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 44.6
Applicability
Crash Type: Vehicle/bicycle
Crash Severity: All
Roadway Types: Not specified
Number of Lanes:
Road Division Type: All
Speed Limit: 40km/h to 130km/h
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:
Country: Denmark
Type of Methodology Used: Before/after using comparison group
Sample Size (crashes): 41 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