CMF / CRF Details

CMF ID: 1971

Increase in horizontal curvature from X to Y degrees (curves)


Prior Condition:  No Prior Condition(s)

Category: Alignment

Study: Horizontal Curve Accident Modification Factor with Consideration of Driveway Density on Rural, Four-Lane Highways in Texas, Fitzpatrick et al., 2009

Star Quality Rating:3 Stars  [View score details]
Rating Points Total:105
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type:All
Crash Severity:K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types:Principal Arterial Other
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:Rural
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:1997 to 2001
Municipality:Ft. Worth, Houston, Bryan, Amarillo, Laredo, San Antonio, Beaumont
Type of Methodology Used:Regression cross-section
Sample Size (sites):520 sites
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Dec 01, 2009