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The utter madness of the US 4-way stop is that you ALWAYS have to stop.
Even when there's no-one else around ... but a copper hidden somewhere behind a bush or sign.
So everyone has to come to a full stop.
Always.
Mythbusters obviously tested the roundabout in what is its LEAST efficient operating mode : when there's lots of traffic coming from all directions.
In this case, traffic on the roundabout tends to hinder traffic getting onto it.
That's when they usually get additional traffic lights in Europe, if the road authority is smart, these only work during peak hours.
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Strayed to the Dark Diesel Side
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