Rule Perform a U-turn on a roundabout by following the circle in your lane; do not cut across the oncoming traffic lane. Explanation By cutting the arc, you enter the oncoming lane and risk a head-on collision. The correct approach is to follow the arc after merging into the proper lane in advance. The safe trajectory is direction B. Tip Get into the correct lane early, use your turn signals when changing lanes and exiting, maintain the flow speed, and check your blind spots.