CMF / CRF Details
Convert intersection to roundabout
Countermeasure ID: 9157
Description:
Prior Condition: No Prior Condition(s)
Category: Intersection geometry
Study: Road safety effects of roundabouts: A meta-analysis, Elvik, R., 2017
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 140 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.56 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.043 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 44 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 4.34 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | A (serious injury),B (minor injury),C (possible injury) |
| 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: | Not specified |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | Not specified |
| If countermeasure is intersection-based | |
| Intersection Type: | Not specified |
| Intersection Geometry: | Not specified |
| 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: | 1975 to 2014 |
| Municipality: | |
| State: | No state(s) chosen. |
| Country: | Multiple countries |
| Type of Methodology Used: | Meta-regression |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Jan 17, 2018 |
| Comments: | Includes single and double lane roundabouts |
