CMF / CRF Details
CMF ID: 7730
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: | 0.857 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 14.3 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Applicability |
|---|
| Crash Type: | Left turn |
| 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): | 216 crashes before, 52.62 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 related crashed on signalized intersections, including not interchange related and interchange related intersections. Applies to approaches with dedicated left turn lanes and PPLT phasing before and after. |
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