掉头 (U-Turn) is a driving maneuver where a vehicle makes a 180-degree turn to go in the opposite direction. This action is often performed at intersections or on roads where it is safe and legal to do so. U-Turns can help drivers quickly change their route without needing to find a longer detour. In many places, specific traffic signs indicate whether U-Turns are allowed. Drivers must ensure that the maneuver is safe, checking for oncoming traffic and pedestrians. Proper signaling is also important to inform other road users of the intention to turn.