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

 
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Crash Modification Factor (CMF)
Value: Equation
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type: All
Crash Severity: All
Roadway Types: Not specified
Number of Lanes:
Road Division Type:
Speed Limit:
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
Municipality: Kerala
State:
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 Central Island Diameter of roundabout (meters). The CMF applies to a roundabout approach leg.