Russ,
Picture this. Vehicle A is traveling from the north to the south and wants to go east and enters the roundabout from the left lane and gets into the inner lane (which he is allowed to do). Vehicle B is travelling straight through from south to north but enters from the right hand lane into the outer lane (which he is allowed to do) just as vehicle A is going by in the inner lane. Now as they approach the east exit with vehicle B slightly behind vehicle A, A has to cut across B’s lane (who is in A’s blind spot) to make the exit.
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