CMF / CRF Details

CMF ID: 7907

Roundabout geometry

Description: Various geometric elements of roundabout

Prior Condition: Circulatory roadway width 7 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)
Value: Equation
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: No values chosen.
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
Municipality: Kerala
Country: India
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 Circulatory roadway width of roundabout (meter). The CMF applies to a roundabout approach.