CMF / CRF Details
CMF ID: 7696
Change from 5-section "doghouse" protected/permissive left turn to flashing yellow arrow protected/permissive left turn
Description: Change from 5-section "doghouse" protected/permissive left turn to FYA protected/permissive left turn
Prior Condition: 5 section doghouse signal
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: | 85 |
Crash Modification Factor (CMF) | |
---|---|
Value: | 0.838 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.053 |
Crash Reduction Factor (CRF) | |
---|---|
Value: | 16.2 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 5.3 |
Applicability | |
---|---|
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: | 20 |
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 3500 to Maximum of 52000 Annual Average Daily Traffic (AADT) |
Minor Road Traffic Volume: | Minimum of 300 to Maximum of 26500 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: | Simple before/after |
Sample Size (crashes): | 441 crashes before, 325 crashes after |
Sample Size (sites): | 156 sites before, 156 sites after |