CMF / CRF Details
CMF ID: 10438
Conversion of intersection into high-speed roundabout
Description: Conversion of intersection into high-speed roundabout
Prior Condition: Minor Road Stop-Controlled Intersections
Category: Intersection geometry
Study: Evaluation of Roundabouts on High-Speed Roadways, Bagley, D.L., 2020
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 105 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.62 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.17 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 38 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 17 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| 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: | 35 |
| Maximum Speed Limit: | 55 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | All |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| If countermeasure is intersection-based | |
| Intersection Type: | Roadway/roadway (not interchange related) |
| Intersection Geometry: | 3-leg |
| Traffic Control: | Roundabout |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| Date Range of Data Used: | 1999 to 2019 |
| Municipality: | |
| State: | NC |
| Country: | |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (sites): | 4 sites before, 4 sites after |
| Sample Size (site-years): | 12 site-years before, 12 site-years after |
