Final answer:
The most common mistakes drivers make when backing up are not checking blind spots, turning the steering wheel in the wrong direction, and underestimating the speed at which they are backing up.
Step-by-step explanation:
The most common mistake that drivers make when backing up is not checking their blind spots. Blind spots are areas around the vehicle that cannot be seen in the rearview and side mirrors. By neglecting to check blind spots, drivers may miss the presence of other vehicles, pedestrians, or obstacles, increasing the risk of a collision.
Another common mistake is not turning the steering wheel in the appropriate direction when backing up. For example, when parallel parking, failing to turn the wheel in the correct direction can lead to hitting the curb or other parked cars.
Lastly, drivers often underestimate the speed at which they are backing up. This can result in collisions with stationary objects, such as light poles or parking barriers. It is important to be aware of the speed and distance when backing up to prevent accidents.