When changing lanes:

Change lane before checking the inside rearview mirror.
Slow down and check your left mirror.
Rely solely on your side mirrors.
Look over your shoulder to make sure no one is in the blind spot.
Explanation

When changing lanes, signal, check all your mirrors, and look over your shoulder in the direction you plan to move. By physically turning your head, you can ensure the lane you want is clear, minimizing the risk of collisions with hidden vehicles.

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This question appears in the following DMV practice tests: