What does 'back' mean in a car?

[MacNevaeh]

Back in a car refers to making a U-turn, which is the operation of changing the direction of the car by 180 degrees under road conditions where U-turns are permitted. Precautions for making a U-turn: Based on road conditions or traffic conditions, try to choose a safe section for U-turns where there is little traffic and it does not hinder the normal passage of vehicles and pedestrians. Choose to make the U-turn at a dashed line; U-turns are not allowed at solid lines. When making a U-turn at a permitted section or intersection, turn on the left turn signal in advance. Change lanes to the left to enter the left U-turn guiding section without affecting the normal driving of other vehicles, and complete the U-turn according to the direction indicated by traffic signs. After entering the solid line area of the intersection, do not change lanes to the left.