CMF / CRF Details
CMF ID: 10826
Change in pavement roughness
Description: Effects of change in pavement roughness, often measured by International Roughness Index (IRI), on crashes
Prior Condition: Existing pavement roughness as measured using IRI
Category: Roadway
Study: Crash Modification Functions for Pavement Surface Condition and Geometric Design Indicators, Cafiso et al., 2021
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 115 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: |  |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: |  |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| 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: | |
| Minimum Speed Limit: | 70 |
| Maximum Speed Limit: | 90 |
| Speed Unit: | km/h |
| Speed Limit Comment: | |
| Area Type: | Rural |
| Traffic Volume: | Minimum of 449 to Maximum of 21313 Annual Average Daily Traffic (AADT) |
| Average Traffic Volume: | 4900 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: | 2011 to 2017 |
| Municipality: | |
| State: | notusa |
| Country: | Italy |
| Type of Methodology Used: | |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Aug 11, 2021 |
| Comments: | Applies to two-lane rural secondary highways. |
