CMF / CRF Details

CMF ID: 8207

Signalize driveway

Description: Driveway is unsignalized

Prior Condition:  Unsignalized driveway

Category: Access management

Study: Safety Analysis of Driveway Characteristics along Major Urban Arterial Corridors in South Carolina, Stokes et al., 2016

Star Quality Rating:3 Stars  [View score details]
Rating Points Total:85
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.73
Crash Reduction Factor (CRF)
Value:-298  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:73
Crash Type:Other
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:All
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Urban
Traffic Volume:
Average Traffic Volume:
Time of Day:Not specified
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:
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:2012 to 2012
Type of Methodology Used:Regression cross-section
Sample Size (sites):3774 sites
Sample Size (site-years):3774 site-years
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Jan 17, 2017
Comments:Applies to driveway-related crashes. This CMF does not account for the fact that signalized driveways in the study had higher traffic volumes. A rectangular buffer area is used to identify driveway-related crashes.