CMF / CRF Details
Provide a channelized left-turn lane on both major- and minor-road approaches
Countermeasure ID: 249
Description: Provide a channelized left-turn lane on both major- and minor-road approaches
Prior Condition: No Prior Condition(s)
Category: Intersection geometry
Study: Handbook of Road Safety Measures, Elvik, R. and Vaa, T., 2004
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 105 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.73 |
| Adjusted Standard Error: | 0.23 |
| Unadjusted Standard Error: | 0.13 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 27 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | 23 |
| Unadjusted Standard Error: | 13 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | A (serious injury),B (minor injury),C (possible injury) |
| Roadway Types: | Not Specified |
| Street Type: | |
| Minimum Number of Lanes: | 2 |
| Maximum Number of Lanes: | 2 |
| 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: | Rural |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | |
| If countermeasure is intersection-based | |
| Intersection Type: | Roadway/roadway (not interchange related) |
| Intersection Geometry: | 3-leg |
| Traffic Control: | Not Specified |
| Major Road Traffic Volume: | Minimum of 5000 to Maximum of 15000 Average Daily Traffic (ADT) |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details | |
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| Date Range of Data Used: | |
| Municipality: | |
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| Country: | |
| Type of Methodology Used: | Meta-analysis |
