CMF / CRF Details
CMF ID: 5626
Change street surface condition from poor to good
Description: Pedestrian crashes only at road segments. Street surface conditions: Poor: serious potholes or other hazards Fair: minor bumps, dips, or rough pavement Good: smooth and free of hazards
Prior Condition: Roadways with poor pavement condition
Category: Roadway
Study: Estimation of the Safety Effect of Pavement Condition on Rural Two-Lane Highways, Zeng et al., 2014
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 120 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 1.03 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.1 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -3 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 10 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| 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: | Not specified |
| Road Division Type: | Undivided |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Rural |
| Traffic Volume: | Minimum of 410 to Maximum of 26943 Annual Average Daily Traffic (AADT) |
| Average Traffic Volume: | 4209 Annual Average Daily Traffic (AADT) |
| 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: | 2007 to 2011 |
| Municipality: | |
| State: | VA |
| Country: | USA |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 146 crashes before, 143 crashes after |
| Sample Size (sites): | 131 sites before, 131 sites after |
| Sample Size (site-years): | 262 site-years before, 262 site-years after |
| Sample Size (miles): | 76 miles before, 76 miles after |
| Sample Size (miles): | 152 mile-years before, 152 mile-years after |
