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I'm not a traffic engineer, but I think roundabouts take more space than an equivalent signal or stop sign intersection. The article says that many places are starting to default to roundabouts, but many intersections are likely going to be difficult to upgrade.

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if roundabouts are already common and drivers behave, a mini roundabout can work

but if they aren't common, so you need to construct it in a way that requires compliance, more space is required

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