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The best way to check for blind spots is to look over your shoulder. This action allows a driver to physically see areas that are not covered by mirrors, which can often miss objects or vehicles directly adjacent to the vehicle. Mirrors provide a limited field of view, and while they are essential for checking traffic behind and alongside the vehicle, they do not capture everything that may be in a driver's blind spot.

By looking over the shoulder, a driver ensures that they have a full awareness of their surroundings. This is especially crucial before changing lanes or merging, as it helps prevent accidents by ensuring that there is no vehicle or object in the blind spot that might not be visible in the mirrors.

While checking mirrors is part of a thorough safety check, and turning one's head might help slightly, these methods do not provide the same level of direct visual confirmation as looking over the shoulder does, making it the most effective approach to blind spot awareness.