CMF / CRF Details
CMF ID: 7687
Change from protected only to flashing yellow arrow protected/permissive left turn
Description: Change from protected only to FYA - protected/permissive left turn
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: | 60 |
Crash Modification Factor (CMF) | |
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Value: | 1.206 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.136 |
Crash Reduction Factor (CRF) | |
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Value: | -20.6 (This value indicates an increase in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 13.6 |
Applicability | |
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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: | 55 |
Speed Unit: | mph |
Speed Limit Comment: | |
Area Type: | Not specified |
Traffic Volume: | |
Average Traffic Volume: | |
Time of Day: | Not specified |
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 12000 to Maximum of 40500 Annual Average Daily Traffic (AADT) |
Minor Road Traffic Volume: | Minimum of 900 to Maximum of 17000 Annual Average Daily Traffic (AADT) |
Average Major Road Volume : | |
Average Minor Road Volume : |
Development Details | |
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Date Range of Data Used: | 2003 to 2013 |
Municipality: | |
State: | NC |
Country: | |
Type of Methodology Used: | Other before/after |
Sample Size (crashes): | 144 crashes before, 170 crashes after |
Sample Size (sites): | 20 sites before, 20 sites after |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Nov 01, 2015 |
Comments: |