CMF / CRF Details
CMF ID: 1444
Install larger signal lenses (12 inch)
Description:
Prior Condition: Replace 8 inch signal heads with 12 inch signal heads.
Category: Intersection traffic control
Study: Low-Cost Safety Improvements Chapter 27, The Traffic Safety Toolbox: a primer on traffic safety, Polanis, 1999
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 40 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.54 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.075 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 46 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 7.5 |
| Applicability | |
|---|---|
| Crash Type: | Angle |
| Crash Severity: | All |
| Roadway Types: | Not specified |
| 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: | |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Urban |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| If countermeasure is intersection-based | |
| Intersection Type: | Roadway/roadway (not interchange related) |
| Intersection Geometry: | |
| Traffic Control: | Signalized |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| Date Range of Data Used: | |
| Municipality: | Winston Salem |
| State: | NC |
| Country: | |
| Type of Methodology Used: | Simple before/after |
| Sample Size (sites): | 44 sites after |
