Well, a roundabout like this will probably totally confuse anyone who doesn't use it on a daily basis. But otherwise roundabouts work well if everyone follows the rules.
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I think that British one is the Magic Roundabout at Swindon, but why do they need all the lane markers and arrows? They seem to do ok without them at the Arc de Triomphe with its 12 entry/exit points. I love watching the traffic navigate this anytime I'm in Paris.