CMF / CRF Details
CMF ID: 4706
Convert high-speed rural intersection to roundabout
Description: Convert high-speed rural intersection to roundabout
Prior Condition: Stop controlled intersection (3 or 4 leg)
Category: Intersection geometry
Study: A Statistical Analysis and Development of a Crash Prediction Model for Roundabouts on High-Speed Rural Roadways, Isebrands, 2012
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 70 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.85 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 15 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Applicability | |
|---|---|
| Crash Type: | Rear end |
| Crash Severity: | All |
| Roadway Types: | Not specified |
| Street Type: | |
| Minimum Number of Lanes: | 1 |
| Maximum Number of Lanes: | 2 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | |
| Minimum Speed Limit: | 40 |
| Maximum Speed Limit: | 65 |
| Speed Unit: | mph |
| 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,4-leg |
| Traffic Control: | Roundabout |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | 14000 Annual Average Daily Traffic (AADT) |
| Average Minor Road Volume : | 5600 Annual Average Daily Traffic (AADT) |
| Development Details | |
|---|---|
| Date Range of Data Used: | |
| Municipality: | |
| State: | KS,MD,MN,OR,WA,WI |
| Country: | |
| Type of Methodology Used: | Simple before/after |
| Sample Size (site-years): | 98 site-years before, 98 site-years after |
