CMF / CRF Details

CMF ID: 10304

Install guiderail with delineators


Prior Condition:  No Prior Condition(s)

Category: Roadside

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

Star Quality Rating:3 Stars  [View score details]
Rating Points Total:80
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.122
Crash Reduction Factor (CRF)
Value:2.9  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:12.2
Crash Type:All
Crash Severity:All
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:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:Rural
Traffic Volume:Minimum of 945 to Maximum of 15007 Annual Average Daily Traffic (AADT)
Average Traffic Volume:3942 Annual Average Daily Traffic (AADT)
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:2009 to 2013
Type of Methodology Used:Regression cross-section
Sample Size (crashes):181 crashes
Sample Size (sites):101 sites
Sample Size (miles):19.09 miles
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Mar 23, 2020
Comments:This CMF is for crashes on Horizontal Curves.