What is a crucial reason to check blind spots before changing lanes?

Checking blind spots before changing lanes is crucial to ensure that there are no vehicles in areas that are not visible in your mirrors. Mirrors can only provide a limited view of the surrounding area, and certain vehicles, particularly those that may be in adjacent lanes or approaching from behind, can be obscured from your view. By checking your blind spots, you can assess if it is safe to change lanes without colliding with another vehicle that you may not have seen. This practice enhances safety by helping drivers make informed decisions and avoid potentially hazardous situations on the road.