CMF / CRF Details
CMF ID: 10430
Conversion of intersection to roundabout
Description: Conversion of stop- and signal-controlled intersections into roundabouts
Prior Condition: No Prior Condition(s)
Category: Intersection geometry
Study: Effect of traffic roundabouts on accident rate and severity in Arizona, Mamlouk and Souliman, 2019
| Star Quality Rating: |
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| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 1.62 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -62 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | Not specified |
| Number of Lanes: | |
| Road Division Type: | |
| Speed Limit: | |
| Area Type: | Urban |
| 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: | Roundabout |
| 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: | AZ |
| Country: | USA |
| Type of Methodology Used: | Simple before/after |
| Sample Size (sites): | 6 sites before, 6 sites after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Jun-01-2020 |
| Comments: | For double-lane roundabout. Change in accident rate per year. |
