Before you change lanes, you should check your mirrors and:

Sound your horn to alert the other drivers.
Quickly pump your brakes.
Look over your shoulder.
Never look over your shoulder.
Explanation

Before changing lanes, you must make sure that you aren't cutting other drivers off. Look in your rearview and side mirrors to ensure there are no vehicles in the lane you want to enter, and glance over your shoulder to check your blind spots.

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