You should never depend on your mirrors when you prepare to change lanes. Why?

Mirrors are useless.
Mirrors need to be adjusted.
Even correctly adjusted mirrors will leave blind spots behind both sides of your vehicle.
Not all vehicles have mirrors.
Explanation

When changing lanes, you should never rely solely on your rear and side-view mirrors, as they can leave blind spots on both sides of your vehicle. Always take a moment to quickly look over your shoulder before changing lanes to ensure the road is clear.

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