CMF / CRF Details
Install centerline and shoulder rumble strips
Countermeasure ID: 6852
Description: Milled or rolled rumble strips.
Prior Condition: No rumble strips in PA and MO. Existing shoulder rumble strips in KY (CL rumble strips as retrofits)
Category: Roadway
Study: Safety Evaluation of Centerline Plus Shoulder Rumble Strips, Persaud et al., 2015
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 140 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.742 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.041 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 25.8 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 4.1 |
| Applicability | |
|---|---|
| Crash Type: | Run off road |
| 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: | Undivided |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Rural |
| Traffic Volume: | Minimum of 154 to Maximum of 25796 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: | |
| Municipality: | |
| State: | KY,MO,PA |
| Country: | USA |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 1871 crashes before, 529 crashes after |
| Sample Size (miles): | 842 miles before, 842 miles after |
| Sample Size (miles): | 6249 mile-years before, 2562 mile-years after |
