CMF / CRF Details

CMF ID: 7905

Roundabout geometry

Description: Various geometric elements of roundabout

Prior Condition:  Central island diameter 8 meters

Category: Intersection geometry

Study: Development of Safety Performance Measures for Urban Roundabouts in India, Anjana and Anjaneyulu, 2015

Star Quality Rating:3 Stars  [View score details]
Rating Points Total:80
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Adjusted Standard Error:
Unadjusted Standard Error:
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:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Urban
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:
Traffic Control:Roundabout
Major Road Traffic Volume:Minimum of 19197 to Maximum of 71307 Average Daily Traffic (ADT)
Minor Road Traffic Volume:
Average Major Road Volume :42332 Average Daily Traffic (ADT)
Average Minor Road Volume :
Development Details
Date Range of Data Used:2008 to 2010
Type of Methodology Used:Regression cross-section
Sample Size (sites):75 sites
Sample Size (site-years):225 site-years
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Mar 08, 2016
Comments:CMF function for total crashes for Central Island Diameter of roundabout (meters). The CMF applies to a roundabout approach leg.