I always thought the dotted lines were there to allow people entering the roundabout from the street to migrate to the inside (left) lane if they're going 3/4 the way around, and to merge back into the right lane when exiting, to get to the residents' gate. Once inside the roundabout, there's no lane changing till you exit.
What they should have done was make the visitors' gate the residents' gate, and vice versa.
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