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On this type of roundabout, remember it is usually a mini-roundabout, what would normally be the right lane is surfaced in red tarmac. Therefore a vehicle turning right would keep off this red area (although there are no signs saying they must do this). This then makes them move over into the left lane which could well be occupied by vehicles turning left, or going straight ahead. Surely this is not only potentially dangerous but also slows down the flow of traffic. Remember, if you are approaching one of these roundabouts, unless you know the road, you have already taken up a position in the right lane, for the right turn and it is not until you reach the mouth of the roundabout that you see this red section, so you have to move over to the left lane to complete your turn.