Which of the following is not a correct procedure when backing up your vehicle?

Using mirrors as the only reference is not a correct procedure when backing up your vehicle. While mirrors provide a view of what's behind and around the vehicle, they do not cover all blind spots. Reliance solely on mirrors can lead to situations where obstacles or pedestrians may go undetected, especially in areas that are not adequately reflected in mirror view. It is vital to combine the use of mirrors with other techniques, such as looking over your shoulder, to have a comprehensive understanding of the surrounding area.

In contrast, scanning the area for obstacles, engaging in constant communication with others around, and having a clear understanding of the backing path are all critical steps that enhance safety when reversing a vehicle. These practices ensure that a driver remains aware of the surroundings and can react swiftly to any unexpected hazards.