CMF / CRF Details

CMF ID: 2123

Install single lane roundabout


Prior Condition: intersections with yield control

Category: Intersection geometry

Study: Turbo Roundabouts: Design Principles and Safety Performance, Fortuijn, 2009

Star Quality Rating: 1 Star   [View score details]
Rating Points Total: 15
Crash Modification Factor (CMF)
Value: 0.319
Adjusted Standard Error:
Unadjusted Standard Error: 0.585
Crash Reduction Factor (CRF)
Value: 68.1   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 58.5
Crash Type: All
Crash Severity: All
Roadway Types: Not Specified
Street Type:
Minimum Number of Lanes: 2
Maximum Number of Lanes: 2
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather: Not specified
Road Division Type:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:
Traffic Volume:
Average Traffic Volume:
Time of Day: All
If countermeasure is intersection-based
Intersection Type: Roadway/roadway (not interchange related)
Intersection Geometry: 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:
Municipality: Netherlands
Type of Methodology Used: Simple before/after
Sample Size (sites): 29 sites after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-01-2009