CMF / CRF Details

CMF ID: 2122

Install single lane roundabout

Description:

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:25
Crash Modification Factor (CMF)
Value:0.213
Adjusted Standard Error:
Unadjusted Standard Error:0.421
Crash Reduction Factor (CRF)
Value:78.7  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:42.1
Applicability
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
State:notusa
Country:
Type of Methodology Used:Simple before/after
Sample Size (sites):39 sites after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Dec 01, 2009
Comments: