CMF / CRF Details
CMF ID: 10292
Four to five lane conversion
Description:
Prior Condition: Four Lane Undivided Roadway (4U)
Category: Roadway
Study: Safety Effectiveness of Roadway Conversion with a Two Way Left Turn Lane, Das et al., 2018
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 85 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.48 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.18 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 52 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 18 |
| Applicability | |
|---|---|
| Crash Type: | All |
| 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: | Urban and suburban |
| Traffic Volume: | |
| Average Traffic Volume: | 19867 Annual Average Daily Traffic (AADT) |
| Time of Day: | All |
| 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: | 2004 to 2010 |
| Municipality: | |
| State: | LA |
| Country: | |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 21 crashes before, 9 crashes after |
| Sample Size (sites): | 1 sites before, 1 sites after |
| Sample Size (miles): | 0.25 miles before, 0.25 miles after |
