Before you change lanes, you should:

Check your left mirror.
Check behind you by looking quickly over your left shoulder.
Keep other vehicles out of your blind spots.
Explanation

It is very important to check behind you before you change lanes. Before changing lanes, check your side and rearview mirrors, and use your turn signal to let other drivers know your plan to change lanes. Before you pull into the left lane, check for any vehicles that may be in your blind spot. Look quickly over your shoulder to make sure there is no vehicle close behind you in the lane you want to enter.

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