CMF / CRF Details
Improve pavement friction (increase skid resistance)
Countermeasure ID: 2263
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: | 130 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.797 |
| Adjusted Standard Error: | 0.052 |
| Unadjusted Standard Error: | 0.052 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 20.3 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | 5.2 |
| Unadjusted Standard Error: | 5.2 |
| Applicability | |
|---|---|
| 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: | 4-leg |
| Traffic Control: | Signalized |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| 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 (site-years): | 348 site-years before, 309 site-years after |
