Which of the following best describes a U-turn?

A U-turn is specifically defined as making a complete turn in the opposite direction. This maneuver involves the driver driving in one direction, then utilizing the roadway to turn back around and head in the reverse direction, effectively creating a "U" shape with the vehicle's path.

When considering the other options, a three-point turn is a different type of maneuver that requires multiple adjustments to change direction and is not classified as a U-turn. A turn at an intersection could imply various types of turns, including left or right turns, but does not necessarily indicate the action of performing a U-turn. Lastly, while a U-turn can be performed in one continuous motion, this description might not always apply, especially in scenarios with tight spaces or when making the turn around obstacles. Thus, option A is the most accurate description of a U-turn, emphasizing the complete shift to the opposite direction.