When backing up, you should:

When backing up, looking through the rear window is essential as it provides the best visibility of what is directly behind your vehicle. This method allows you to see any obstacles, pedestrians, or other vehicles that may not be visible in your mirrors. The rear window gives you a clear line of sight, facilitating safer maneuvering and reducing the risk of accidents. While mirrors are useful for checking surrounding areas and ensuring a wider view, they cannot entirely replace the direct view provided by looking out the rear window.

Focusing solely on the front view while backing up can lead to missing critical information about what is behind you. Using your horn can alert others of your presence, but it does not replace the need for careful visual observation and can create confusion if overused or misused. Therefore, the safest practice is to look through the rear window when backing up, as it enhances your awareness and helps ensure you do not hit any objects or pedestrians.