CMF / CRF Details
CMF ID: 9114
Install snow fencing
Description:
Prior Condition: No snow fences
Category: Roadside
Study: Investigating Safety Effectiveness of Wyoming Snow Fence Installations Along a Rural Mountainous Freeway, Peel et al., 2017
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 95 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.75 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.047 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 25 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 4.7 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | Principal Arterial Interstate |
| 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: | 75 |
| Maximum Speed Limit: | 75 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | Rural |
| Traffic Volume: | Minimum of 5855 to Maximum of 6830 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: | 2003 to 2011 |
| Municipality: | |
| State: | WY |
| Country: | USA |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 496 crashes before, 457 crashes after |
| Sample Size (sites): | 1 sites before, 1 sites after |
| Sample Size (site-years): | 4 site-years before, 4 site-years after |
| Sample Size (miles): | 19 miles before, 19 miles after |
| Sample Size (miles): | 76 mile-years before, 76 mile-years after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Jan 17, 2018 |
| Comments: | For all weather conditions |
