CMF / CRF Details
CMF ID: 2258
Improve pavement friction (increase skid resistance)
Description:
Prior Condition: Increase pavement friction on curves from a SCRIM value of less than 50 to a SCRIM value greater than 60.
Category: Roadway
Study: Effects of pavement friction improvements on crash rates on Spanish two-lane rural roads, Mayora and Pina, 2008
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 85 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.52 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.02 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 47.7 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 1.97 |
| Applicability | |
|---|---|
| Crash Type: | Wet road |
| 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: | Wet road |
| Road Division Type: | Undivided |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Rural |
| Traffic Volume: | Minimum of 403 to Maximum of 36372 |
| 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: | 1993 to 2002 |
| Municipality: | Central and Western Spain |
| State: | notusa |
| Country: | |
| Type of Methodology Used: | Simple before/after |
| Sample Size (crashes): | 96 crashes before, 79 crashes after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Jan 01, 1970 |
| Comments: | |
