CMF / CRF Details
CMF ID: 6679
Install shoulder rumble strips
Description:
Prior Condition: No shoulder rumble strips
Category: Shoulder treatments
Study: Relating crash frequency and severity: Evaluating the effectiveness of shoulder rumble strips on reducing fatal and major injury crashes, Wu et al., 2014
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 85 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.93 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.037 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 7 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 3.7 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | All |
| Street Type: | |
| Minimum Number of Lanes: | |
| Maximum Number of Lanes: | |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | All |
| Minimum Speed Limit: | 25 |
| Maximum Speed Limit: | 65 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | All |
| Traffic Volume: | Minimum of 582 to Maximum of 22607 Annual Average Daily Traffic (AADT) |
| Average Traffic Volume: | |
| 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: | 2002 to 2009 |
| Municipality: | |
| State: | PA |
| Country: | USA |
| Type of Methodology Used: | Time series |
| Sample Size (crashes): | 5629 crashes |
| Sample Size (sites): | 310 sites |
| Sample Size (site-years): | 2168 site-years |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Jun 22, 2015 |
| Comments: | |
