CMF / CRF Details
CMF ID: 9402
Change from protected-permissive to flashing yellow arrow protected-permissive on approach
Description: Change from protected-permissive left-turn phasing to FYA on one approach. CMF applies at the approach level.
Prior Condition: Left-turn approach with protected-permissive phasing
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: | 70 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.9778 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.1216 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 2.22 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 12.16 |
| 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: | |
| 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 | |
|---|---|
| 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): | 247 crashes before, 472 crashes after |
| Sample Size (sites): | 68 sites before, 68 sites after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Oct 27, 2018 |
| Comments: | This CMF applies to left-turn related crashes on the approach level. |
