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xkcd #2842: Inspiraling Roundabout
(imgs.xkcd.com)
Alt text:
Look, I just think we need to stop coddling those hedonistic roundabout hogs who get into the inner lane and circle for hours, wasting valuable capacity.
You shouldn't have to lane shift in roundabouts. On a well designed multi lane roundabout you choose your lane before you get there and simply follow it to the exit. The only reason to change lanes is if you screwed up.