CMF / CRF Details
Conversion of intersection into single-lane roundabout
Countermeasure ID: 9313
Description: Conversion of intersection into single-lane roundabout
Prior Condition: signalized, stop-controlled, yield-controlled and non-controlled intersections
Category: Intersection geometry
Study: Safe roundabouts for cyclists, Jensen, S. U., 2017
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 45 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.71 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.362 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 29 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 36.2 |
| Applicability | |
|---|---|
| Crash Type: | Vehicle/bicycle |
| 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: | All |
| Minimum Speed Limit: | 40 |
| Maximum Speed Limit: | 130 |
| Speed Unit: | km/h |
| Speed Limit Comment: | |
| Area Type: | Urban |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| If countermeasure is intersection-based | |
| Intersection Type: | Roadway/roadway (not interchange related) |
| Intersection Geometry: | No values chosen. |
| Traffic Control: | Not specified |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| Date Range of Data Used: | |
| Municipality: | |
| State: | notusa |
| Country: | Denmark |
| Type of Methodology Used: | Before/after using comparison group |
| Sample Size (crashes): | 7 crashes after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Jun 17, 2018 |
| Comments: | Central island height=20 to 10mCentral island diameter=20m-39.9m |
