CMF / CRF Details
CMF ID: 8075
Install centerline rumble strips
Description:
Prior Condition: Roadway without centerline rumble strips
Category: Roadway
Study: Evaluation of Non-freeway Rumble Strips-Phase II, Datta et al., 2015
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 40 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.492 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.039 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 50.83 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 3.9 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | Principal Arterial Other |
| 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: | 55 |
| Maximum Speed Limit: | 55 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | Rural |
| Traffic Volume: | Minimum of 7500 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 2013 |
| Municipality: | |
| State: | MI |
| Country: | |
| Type of Methodology Used: | Simple before/after |
| Sample Size (crashes): | 480 crashes before, 236 crashes after |
| Sample Size (sites): | 212 sites before, 212 sites after |
| Sample Size (site-years): | 636 site-years before, 636 site-years after |
| Sample Size (miles): | 401 miles before, 401 miles after |
| Sample Size (miles): | 1203 mile-years before, 1203 mile-years after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Nov 10, 2016 |
| Comments: | CMF applies to roadways with AADT >7500 |
