CMF / CRF Details
Road diet (Convert 4-lane undivided road to 2-lanes plus turning lane)
Countermeasure ID: 10376
Description:
Prior Condition: Urban 4-lane undivided roadway
Category: Roadway
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 125 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.613 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.125 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 38.7 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 12.5 |
| Applicability | |
|---|---|
| Crash Type: | Non-intersection |
| Crash Severity: | All |
| Roadway Types: | Not specified |
| Street Type: | |
| Minimum Number of Lanes: | 4 |
| Maximum Number of Lanes: | 4 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | Undivided |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Urban |
| Traffic Volume: | Minimum of 8333 to Maximum of 13900 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: | 2005 to 2016 |
| Municipality: | |
| State: | LA |
| Country: | USA |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 60 crashes before, 40 crashes after |
| Sample Size (sites): | 4 sites before, 4 sites after |
| Sample Size (miles): | 3.92 miles before, 3.92 miles after |
