CMF / CRF Details
CMF ID: 9833
Install edgeline rumble strips at horizontal curve
Description: Install edgeline rumble strips at horizontal curve
Prior Condition: No Prior Condition(s)
Category: Roadway
Study: Safety Evaluation of Edge-Line Rumble Stripes on Rural Two-Lane Horizontal Curves, Himes et al., 2017
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 115 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.63 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.14 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 37 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 14 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | All |
| 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 412 to Maximum of 4268 Annual Average Daily Traffic (AADT) |
| Average Traffic Volume: | 1589 Annual Average Daily Traffic (AADT) |
| 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: | 2004 to 2012 |
| Municipality: | |
| State: | KY |
| Country: | USA |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 88 crashes before, 21 crashes after |
| Sample Size (miles): | 15.59 miles before, 15.59 miles after |
| Sample Size (miles): | 90.38 mile-years before, 34.36 mile-years after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Oct 27, 2018 |
| Comments: | The CMF is for Nighttime crashes (all types and severities combined). |
