I never enter a round-a-bout when there is a car coming in either lane because you never know where the person on the inside lane intends to exit. Yield to those coming before you and there is no problem.
I just realized you were talking about exiting, not entering. But the same holds true - yield to those already in the circle because I believe it is legal to cross the dotted line to get into the lane you wish to exit from.
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