Three of the most important times to check traffic behind you are before:

Stopping suddenly, making a wide turn, or passing through traffic lights.
Backing, making a sharp turn, or crossing an intersection.
Crossing intersections or following other vehicles.
Backing, changing lanes, or slowing down quickly.
Explanation

Before backing, it's important to check behind you, as visibility is limited and unexpected obstacles may be present. Changing lanes requires you to check for vehicles in your blind spots to avoid collisions. When you slow down quickly, it can catch drivers behind you off guard, so checking your mirrors first helps ensure that they have enough time to react. In all of these cases, looking behind helps you anticipate and avoid potential hazards.

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