CMF / CRF Details
Replace TWLTL with raised median
Countermeasure ID: 2519
Description:
Prior Condition: Two way left turn lane (TWLTL)
Category: Access management
Study: Modeling and Evaluating the Safety Impacts of Access Management (AM) Features in the Las Vegas Valley, Mauga and Kaseko, 2010
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.79 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.0721 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 21 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 7.21 |
| Applicability |
|---|
| Crash Type: | Angle,Fixed object,Head on,Rear end,Run off road,Sideswipe,Single vehicle |
| Crash Severity: | A (serious injury),B (minor injury),C (possible injury) |
| Roadway Types: | All |
| 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: | 30 |
| Maximum Speed Limit: | 45 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | Urban |
| Traffic Volume: | Minimum of 4883 to Maximum of 96080 Annual Average Daily Traffic (AADT) |
| Average Traffic Volume: | |
| Time of Day: | Not specified |
| If countermeasure is intersection-based |
| Intersection Type: | |
| Intersection Geometry: | |
| Traffic Control: | |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details |
|---|
| Date Range of Data Used: | 2002 to 2006 |
| Municipality: | |
| State: | NV |
| Country: | |
| Type of Methodology Used: | Regression cross-section |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Aug 11, 2010 |
| Comments: | |
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