CMF / CRF Details
CMF ID: 9945
Improve pavement condition as measured by International Roughness Index (IRI)
Description:
Prior Condition: Pavement with lower IRI
Category: Roadway
Study: Safety Effects of Pavement Maintenance Treatments for Two-Lane Rural Roads – Insights for Pavement Management, Nemtsov et al., 2019
| Star Quality Rating: | Cannot Be Rated (Insufficient Information) |
| Rating Points Total: | |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.999 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.055 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 0.1 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 5.5 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | K (fatal),A (serious injury) |
| Roadway Types: | All |
| Street Type: | |
| Minimum Number of Lanes: | 2 |
| Maximum Number of Lanes: | 2 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | Undivided |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Rural |
| Traffic Volume: | Minimum of 500 to Maximum of 27300 Annual Average Daily Traffic (AADT) |
| Average Traffic Volume: | 5046 Annual Average Daily Traffic (AADT) |
| Time of Day: | |
| 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 2013 |
| Municipality: | Ontario |
| State: | notusa |
| Country: | Canada |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (sites): | 183 sites before, 183 sites after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Mar 18, 2019 |
| Comments: | CMF for sites with before crashes/km/year less than 0.18 |
