CMF / CRF Details

CMF ID: 10303

Change horizontal alignment

Description: change horizontal alignment

Prior Condition:  No Prior Condition(s)

Category: Alignment

Study: Reducing Roadway Departure Crashes at Horizontal Curve Sections on Two-lane Rural Highways, Donnell et al., 2019

Star Quality Rating:4 Stars  [View score details]
Rating Points Total:115
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type:Fixed object,Head on,Run off road,Sideswipe
Crash Severity:K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types:Not specified
Street Type:
Minimum Number of Lanes:2
Maximum Number of Lanes:2
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Undivided
Minimum Speed Limit:20
Maximum Speed Limit:55
Speed Unit:mph
Speed Limit Comment:
Area Type:Rural
Traffic Volume:Minimum of 15 to Maximum of 27224 Annual Average Daily Traffic (AADT)
Average Traffic Volume:4239 Annual Average Daily Traffic (AADT)
Time of Day:
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:2008 to 2013
Type of Methodology Used:Regression cross-section
Sample Size (crashes):533 crashes
Sample Size (sites):889 sites
Sample Size (miles):166.4 miles
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Mar 23, 2020
Comments:The Crash Type for this CMF was updated on Feb 15, 2021 to reflect Fixed Object, Head On, Run Off Road, and Sideswipe crashes. The Crash Type was previously only identified as Run Off Road crashes. This CMF is for crashes on Horizontal Curves