Before changing lanes:

Check your side and rearview mirrors.
Check for other drivers who may be moving into the same lane as you.
Use your turn signal.
All of the above.
Explanation

Before changing lanes, always make sure there are no vehicles in the lane you want to enter. Check your side and rearview mirrors for traffic approaching you from behind, and turn on your turn signal to let other drivers know your intentions well in advance.

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