CMF / CRF Details
CMF ID: 9793
Conversion of intersection into single-lane roundabout
Description: Conversion of intersection into single-lane roundabout
Prior Condition: All way stop
Category: Intersection geometry
Study: Crash Modification Factors Based on Crash Histories of 148 Modern Roundabouts in Five States, Zhang and Wang, 2017
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 10 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 1.15 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 1.07 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -15 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 107 |
| Applicability | |
|---|---|
| Crash Type: | All |
| 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: | |
| 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: | |
| 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 2013 |
| Municipality: | |
| State: | FL,IN,NY,PA,WA |
| Country: | USA |
| Type of Methodology Used: | Simple before/after |
| Sample Size (sites): | 6 sites before, 6 sites after |
