CMF / CRF Details

CMF ID: 9157

Convert intersection to roundabout

Description:

Prior Condition:  No Prior Condition(s)

Category: Intersection geometry

Study: Road safety effects of roundabouts: A meta-analysis, Elvik, R., 2017

 
Star Quality Rating:5 Stars  [View score details]
Rating Points Total:140
Crash Modification Factor (CMF)
Value:0.56
Adjusted Standard Error:
Unadjusted Standard Error:0.043
Crash Reduction Factor (CRF)
Value:44  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:4.34
Applicability
Crash Type:All
Crash Severity:A (serious injury),B (minor injury),C (possible injury)
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:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Not specified
Traffic Volume:
Average Traffic Volume:
Time of Day:Not specified
If countermeasure is intersection-based
Intersection Type:Not specified
Intersection Geometry:Not specified
Traffic Control:
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:1975 to 2014
Municipality:
State:No state(s) chosen.
Country:Multiple countries
Type of Methodology Used:Meta-regression
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Jan 17, 2018
Comments:Includes single and double lane roundabouts