CMF / CRF Details
CMF ID: 7763
Install shoulder rumble strips and widen shoulder width
Description: A combination of adding shoulder rumble strips and widening shoulder width
Prior Condition: Roadways without shoulder rumble strips and narrow shoulders
Category: Shoulder treatments
Study: Validation and Application of Highway Safety Manual (Part D) in Florida, Abdel-Aty et al., 2014
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 60 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.48 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.06 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 52 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 6 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | All |
| Street Type: | |
| Minimum Number of Lanes: | 2 |
| Maximum Number of Lanes: | |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | > = 2 Lanes |
| Crash Weather: | Not specified |
| Road Division Type: | All |
| Minimum Speed Limit: | 65 |
| Maximum Speed Limit: | 70 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | Rural |
| Traffic Volume: | Minimum of 2000 to Maximum of 50000 Annual Average Daily Traffic (AADT) |
| Average Traffic Volume: | |
| 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: | 2005 to 2010 |
| Municipality: | |
| State: | FL |
| Country: | USA |
| Type of Methodology Used: | Before/after using comparison group |
| Sample Size (sites): | 27 sites before, 27 sites after |
| Sample Size (site-years): | 54 site-years before, 54 site-years after |
