CMF / CRF Details
CMF ID: 7731
Install left turn flashing yellow arrow signals and supplemental traffic signs
Description:
Install left turn flashing yellow arrow signals with supplemental traffic signs with text "Left Turn Yield on Flashing Yellow Arrow"
Prior Condition: Permissive phase of the PPLT control operated with a circular green indication
Category: Intersection traffic control
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.901 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 9.87 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Applicability |
|---|
| Crash Type: | Other |
| Crash Severity: | All |
| Roadway Types: | All |
| Street Type: | |
| Minimum Number of Lanes: | 2 |
| Maximum Number of Lanes: | 7 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | All |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Urban |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| If countermeasure is intersection-based |
| Intersection Type: | |
| Intersection Geometry: | 3-leg,4-leg |
| Traffic Control: | Signalized |
| Major Road Traffic Volume: | Minimum of 3250 to Maximum of 37500 Average Daily Traffic (ADT) |
| Minor Road Traffic Volume: | Minimum of 63 to Maximum of 14700 Average Daily Traffic (ADT) |
| Average Major Road Volume : | 17215 Average Daily Traffic (ADT) |
| Average Minor Road Volume : | 4576 Average Daily Traffic (ADT) |
| Development Details |
|---|
| Date Range of Data Used: | 2007 to 2013 |
| Municipality: | Peoria |
| State: | IL |
| Country: | USA |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 149 crashes before, 36.02 crashes after |
| Sample Size (sites): | 90 sites before, 90 sites after |
| Sample Size (site-years): | 270 site-years before |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Mar 08, 2016 |
| Comments: | CMFs of left-turn opposing through (LTOT) crashes on signalized intersections, including not interchange related and interchange related intersections. Left-turn opposing through (LTOT) crashes involve one vehicle turning left from one approach and one vehicle going straight from the opposite approach. Applies to approaches with dedicated left turn lanes and PPLT phasing before and after. |
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