CMF / CRF Details

CMF ID: 3942

Change number of 4-or-more-leg intersections from X to Y

Description: Study relates number of crashes in small geographic area (census block group) to number of 4-or-more-leg intersections in the same area.

Prior Condition:  Existing number of 4-or-more-leg intersections in the study area is X.

Category: Access management

Study: Designing for the Safety of Pedestrians, Cyclists, and Motorists in Urban Environments, Dumbaugh and Li, 2011

Star Quality Rating:3 Stars  [View score details]
Rating Points Total:95
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type:Angle,Cross median,Head on,Left turn,Rear end,Rear to rear,Right turn,Sideswipe
Crash Severity:All
Roadway Types:All
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:All
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:Not specified
Intersection Geometry:4-leg,More than 4 legs
Traffic Control:Not specified
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:2003 to 2007
Municipality:San Antonio-Bexar County
Type of Methodology Used:Regression cross-section
Sample Size (crashes):217028 crashes
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Jun 04, 2012
Comments:Roadway Type: All except local.Crash Type: Multiple-vehicleThe study calibrated crash models on regional-level and not intersection-level. The metro region is divided as census block groups.