CMF / CRF Details

CMF ID: 9465

Change driveway type

Description: Change driveway classification type

Prior Condition:  Industrial/Institutional driveway on 5-lane urban roadway with TWLTL

Category: Access management

Study: Safety Effects of Different Driveway Types Defined in Highway Safety Manual, Williamson et al., 2018

Star Quality Rating:2 Stars  [View score details]
Rating Points Total:40
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value:-349.3  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type:Angle,Fixed object,Left turn,Rear end,Vehicle/bicycle,Vehicle/pedestrian
Crash Severity:All
Roadway Types:Not specified
Street Type:
Minimum Number of Lanes:5
Maximum Number of Lanes:5
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Divided by TWLTL
Minimum Speed Limit:35
Maximum Speed Limit:40
Speed Unit:mph
Speed Limit Comment:
Area Type:Urban and suburban
Traffic Volume:
Average Traffic Volume:
Time of Day:All
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:2005 to 2009
Country:United States
Type of Methodology Used:Regression cross-section
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Oct 27, 2018
Comments:This CMF applies to the change from industrial/institutional driveway to commercial driveway with drive through.