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xkcd #2932: Driving PSA
(imgs.xkcd.com)
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It's more the amount of choke points that turn to gridlock at rush hour. That plus it's the Midwest so 85% of the population doesn't understand how they work.
I think it's probably got more to do with the drivers. There are plenty of roundabouts like this where I am in Aus, and they get used just fine. Over here they have a far lower rate of accidents than other types of intersections. We never have 4 way stops either, we just put a roundabout there.