What is indicated by a driver making a U-turn?

Answer: B — They are changing direction

A driver making a U-turn is primarily indicating that they are changing direction. This maneuver involves turning the vehicle around to go in the opposite direction, which typically requires entering into the opposing lane of traffic. U-turns are executed to facilitate a complete turnaround, allowing drivers to head back the way they came or to redirect their movement toward a different destination. While the other options might describe actions that involve some form of direction change or movement, they do not specifically capture the intent and nature of a U-turn itself. Reversing, for instance, does not involve a complete directional turnaround as it simply means moving backward instead of forward. Parking refers to stopping the vehicle and leaving it stationary, while joining the highway suggests merging into traffic rather than making a direct U-turn.