Final answer:
When backing up, it's important to not only use mirrors but also to turn and look directly over your shoulder to cover blind spots and ensure safety.
Step-by-step explanation:
When backing up, you should not only look in your mirrors but turn your head to look over your shoulder at the area behind your vehicle as well. While mirrors provide a significant field of vision, there are always blind spots that mirrors cannot cover. Turning your head to look directly through the rear window gives you a more comprehensive view of the area behind you, ensuring that you are aware of all obstacles, pedestrians, or other vehicles that may not be visible in your mirrors. It is vital to combine the use of mirrors with direct visual checks to make the safest possible maneuver.