CMF / CRF Details
CMF ID: 7745
Install shoulder rumble strips
Description:
Prior Condition: Roadways without should rumble strips
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: | 40 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.678 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.253 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 32.2 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 25.3 |
| Applicability | |
|---|---|
| Crash Type: | Run off road |
| Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
| 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: | |
| 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: | 2007 to 2010 |
| Municipality: | |
| State: | FL |
| Country: | USA |
| Type of Methodology Used: | Before/after using comparison group |
| Sample Size (crashes): | 17 crashes before, 9 crashes after |
| Sample Size (sites): | 48 sites before, 48 sites after |
| Sample Size (site-years): | 96 site-years before, 96 site-years after |
| Sample Size (miles): | 43.451 miles before, 43.451 miles after |
| Sample Size (miles): | 86.9 mile-years before, 86.9 mile-years after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Mar 08, 2016 |
| Comments: | This CMF applies to single-vehicle run-off-road crashes |
