CMF / CRF Details

CMF ID: 2259

Improve pavement friction (increase skid resistance)


Prior Condition:  Sections of pavement with both a high proportion (35-40%) of wet-road crashes and low friction numbers (<32).

Category: Roadway

Study: Safety Effects of a Targeted Skid Resistance Improvement Program, Lyon and Persaud, 2008

Star Quality Rating:4 Stars  [View score details]
Rating Points Total:130
Crash Modification Factor (CMF)
Adjusted Standard Error:0.028
Unadjusted Standard Error:0.028
Crash Reduction Factor (CRF)
Value:20.1  (This value indicates a decrease in crashes)
Adjusted Standard Error:2.8
Unadjusted Standard Error:2.8
Crash Type:All
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:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:All
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:
Traffic Control:
Major Road Traffic Volume:Minimum of 3475 to Maximum of 65850 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume:Minimum of 174 to Maximum of 10055 Annual Average Daily Traffic (AADT)
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:1994 to 2003
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Sample Size (crashes):2857 crashes before, 1581 crashes after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Jan 01, 1970