CMF / CRF Details
CMF ID: 7879
Improve pavement friction (Chip Seal)
Description: Chip seal treatment to improve pavement friction
Prior Condition: Untreated pavements
Category: Roadway
Study: Evaluation of Pavement Safety Performance, Merritt et al., 2015
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 100 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 1.015 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.063 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -1.5 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 6.3 |
| Applicability | |
|---|---|
| Crash Type: | Wet road |
| 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: | Wet road |
| Road Division Type: | All |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | All |
| Traffic Volume: | Minimum of 170 to Maximum of 24792 Annual Average Daily Traffic (AADT) |
| Average Traffic Volume: | 2751 Annual Average Daily Traffic (AADT) |
| Time of Day: | Not specified |
| 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: | 2000 to 2011 |
| Municipality: | |
| State: | NC,PA |
| Country: | USA |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
