CMF / CRF Details
CMF ID: 9694
Install centerline rumble strips (horizontal curves)
Description: Install centerline rumble strips on horizontal curves
Prior Condition: No Prior Condition(s)
Category: Roadway
Study: Examining the Safety Effect of Centerline Rumble Strips on Curves on Rural Two-Lane Roads, Babiceanu and Fontaine, 2018
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 70 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 1.202 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.21 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -20.2 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 21 |
| Applicability | |
|---|---|
| Crash Type: | Fixed object,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: | Minimum of 2100 to Maximum of 18000 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: | 2004 to 2016 |
| Municipality: | |
| State: | VA |
| Country: | USA |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 27 crashes before, 39 crashes after |
| Sample Size (miles): | 18.17 miles before, 18.17 miles after |
| Sample Size (miles): | 90.85 mile-years before, 90.85 mile-years after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Oct 27, 2018 |
| Comments: | CMF for off-road fixed object and run-off-road crashes. Roads with design speeds 60mph or higher. |
