CMF / CRF Details
CMF ID: 9401
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 left-turn phasing on the approach.
Category: Intersection traffic control
Study: Approach-Level Safety Comparison of Permissive-Protected and Protected Left Turn Phasing to Flashing Yellow Areas, Shea and Medina, 2018
Star Quality Rating: | [View score details] |
Rating Points Total: | 90 |
Crash Modification Factor (CMF) | |
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Value: | 3.428 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.3093 |
Crash Reduction Factor (CRF) | |
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Value: | -242.8 (This value indicates an increase in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 30.93 |
Applicability | |
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Crash Type: | Left turn |
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: | Not specified |
Traffic Volume: | |
Average Traffic Volume: | |
Time of Day: | All |
If countermeasure is intersection-based | |
Intersection Type: | Not specified |
Intersection Geometry: | |
Traffic Control: | Signalized |
Major Road Traffic Volume: | |
Minor Road Traffic Volume: | |
Average Major Road Volume : | |
Average Minor Road Volume : |
Development Details | |
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Date Range of Data Used: | 2011 to 2016 |
Municipality: | |
State: | UT |
Country: | United States |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (crashes): | 64 crashes before, 180 crashes after |
Sample Size (sites): | 40 sites before, 40 sites after |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Oct 27, 2018 |
Comments: | This CMF applies at the approach level, not at the intersection level. |