Roundabouts are nothing but a traffic light replacement and work EXACTLY the same way.
If you wanted to turn right at a traffic light, you would make that lane choice before getting there and come at it from the right hand lane. You would also yield to anyone already in the traffic flow.
If you wanted to turn left at a traffic light you would make that lane choice before getting there and come at it from the left hand lane.
If you were planning to go straight through you would use either lane.
Traffic light and roundabout work the same.
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