CMF / CRF Details
CMF ID: 7693
Change from protected only to flashing yellow arrow protected/permissive left turn with time of day operation
Description: Change from protected only to FYA - protected/permissive left turn with time of day operation
Prior Condition: Protected phasing
Category: Intersection traffic control
Study: Safety Effectiveness of Flashing Yellow Arrow: Evaluation of 222 Signalized Intersections in North Carolina, Simpson and Troy, 2015
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 45 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 2.371 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 1.043 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -137.1 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 104.3 |
| Applicability | |
|---|---|
| Crash Type: | Left turn |
| Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
| 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: | 35 |
| Maximum Speed Limit: | 45 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | Not specified |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| If countermeasure is intersection-based | |
| Intersection Type: | Roadway/roadway (not interchange related) |
| Intersection Geometry: | 4-leg |
| Traffic Control: | Signalized |
| Major Road Traffic Volume: | Minimum of 18000 to Maximum of 41000 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | Minimum of 3000 to Maximum of 32000 Annual Average Daily Traffic (AADT) |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| Date Range of Data Used: | 2003 to 2013 |
| Municipality: | |
| State: | NC |
| Country: | |
| Type of Methodology Used: | Other before/after |
| Sample Size (crashes): | 4 crashes before, 13 crashes after |
| Sample Size (sites): | 16 sites before, 16 sites after |
