CMF / CRF Details
Change from permissive only to flashing yellow arrow protected/permissive left turn
Countermeasure ID: 7683
Description: Change from permissive only to FYA - protected/permissive left turn
Prior Condition: Permissive phasing
Category: Intersection traffic control
Study: Safety Effectiveness of Flashing Yellow Arrow: Evaluation of 222 Signalized Intersections in North Carolina, Simpson and Troy, 2015
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.654 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.128 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 34.6 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 12.8 |
| Applicability |
|---|
| Crash Type: | All |
| 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: | |
| If countermeasure is intersection-based |
| Intersection Type: | Roadway/roadway (not interchange related) |
| Intersection Geometry: | 3-leg,4-leg |
| Traffic Control: | Signalized |
| Major Road Traffic Volume: | Minimum of 7000 to Maximum of 24000 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | Minimum of 1100 to Maximum of 9300 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): | 66 crashes before, 41 crashes after |
| Sample Size (sites): | 13 sites before, 13 sites after |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Nov 01, 2015 |
| Comments: | |
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