CMF / CRF Details
Conversion of intersection into multi-lane roundabout
Countermeasure ID: 9789
Description: Conversion of intersection into multi-lane roundabout.
Prior Condition: Traffic circle
Category: Intersection geometry
Study: Crash Modification Factors Based on Crash Histories of 148 Modern Roundabouts in Five States, Zhang and Wang, 2017
| Crash Modification Factor (CMF) |
|---|
| Value: | 3.06 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.79 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | -206 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 79 |
| 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: | Roadway/roadway (not interchange related) |
| Intersection Geometry: | Not specified |
| Traffic Control: | Stop-controlled |
| 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 (crashes): | 60 crashes before, 245 crashes after |
| Sample Size (sites): | 1 sites before, 1 sites after |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Oct 27, 2018 |
| Comments: | Traffic circle to multi-lane roundabout |
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