Three of the following four are good practices before backing. Which is NOT?

The correct answer identifies a practice that is not necessarily related to the immediate and critical safety measures one should take before backing up a vehicle. Informing the operator or completing paperwork may be important in various contexts, such as coordinating with team members or maintaining records, but it does not directly enhance safety during the act of reversing.

In contrast, the other choices emphasize actions that directly contribute to a safer backing process. Sounding the horn is a way to alert others around you that you are about to back up, potentially preventing accidents. Turning off distractions such as the radio or phone helps the driver to focus entirely on their surroundings, which is crucial for making safe backing decisions. Opening the window allows for better auditory awareness of sounds that may indicate a person or object is behind the vehicle, ensuring a clearer perception of the environment.

These practices collectively foster a safer scenario when backing up by ensuring that the driver is more aware and alert, thereby reducing the risk of incidents.