CMF / CRF Details
CMF ID: 2286
Improve pavement friction (increase skid resistance)
Description:
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: | [View score details] |
Rating Points Total: | 110 |
Crash Modification Factor (CMF) | |
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Value: | 1.045 |
Adjusted Standard Error: | 0.078 |
Unadjusted Standard Error: | 0.078 |
Crash Reduction Factor (CRF) | |
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Value: | -4.5 (This value indicates an increase in crashes) |
Adjusted Standard Error: | 7.8 |
Unadjusted Standard Error: | 7.8 |
Applicability | |
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Crash Type: | Angle |
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 | |
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Date Range of Data Used: | 1994 to 2003 |
Municipality: | |
State: | NY |
Country: | |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (crashes): | 501 crashes before, 336 crashes after |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Jan 01, 1970 |
Comments: |