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

Backing up, increasing your speed or making a sharp turn.
Making a sharp turn, crossing intersections, or following other vehicles.
Backing up, changing lanes, or slowing down quickly.
Backing up, making a sharp turn, or crossing an intersection.
Explanation

It is very important to check behind you before specific driving maneuvers. When backing, always check behind you to ensure there are no pedestrians, bicyclists, or vehicles in your path. Before changing lanes, check the rearview and side mirrors to see any approaching vehicles. Before slowing down quickly, checking behind you ensures that the abrupt change in speed is done safely, preventing potential rear-end collisions.

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