CMF / CRF Details
CMF ID: 3601
Install shoulder rumble strips
Description:
Prior Condition: No Prior Condition(s)
Category: Shoulder treatments
Study: NCHRP Report 641: Guidance for the Design and Application of Shoulder and Centerline Rumble Strips, Torbic et al., 2009
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 130 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.74 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.0764 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 26 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 7.64 |
| Applicability | |
|---|---|
| Crash Type: | Run off road |
| Crash Severity: | All |
| Roadway Types: | Principal Arterial Other Freeways and Expressways |
| 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: | Divided by Median |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Rural |
| Traffic Volume: | Minimum of 11539 to Maximum of 37112 Average Daily Traffic (ADT) |
| Average Traffic Volume: | |
| Time of Day: | Night |
| 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: | 1997 to 2006 |
| Municipality: | |
| State: | MO |
| Country: | U.S.A. |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 235 crashes before, 103 crashes after |
