CMF / CRF Details
CMF ID: 1405
Provide split phases
Description: The regular 2 phases of a cycle are split into three phases. Pedestrians receive a "walk" display while the parallel traffic that would normally turn left or right through the crosswalk is held with a left or right red arrow signal and the through movement proceeds on a green signal. After the pedestrian crossing is completed, a red "steady hand" is displayed and the turns are then made on a green arrow signal while the through movement continues to move. Split phase requires dedicated turn lanes since through and turning movements are governed by different signal indications.
Prior Condition: No Prior Condition(s)
Category: Intersection traffic control
Study: Toolbox of Countermeasures and Their Potential Effectiveness to Make Intersections Safer, ITE, 2004
Image: View the countermeasure image.
| Star Quality Rating: | Cannot Be Rated |
| Rating Points Total: | |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.75 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) | |
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| Value: | 25 (This value indicates a decrease in crashes) |
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| Applicability | |
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| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | Not specified |
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| Crash Weather: | Not specified |
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| If countermeasure is intersection-based | |
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| Traffic Control: | Signalized |
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| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Dec 01, 2009 |
| Comments: | |
