Before you change lanes, you should:

Always turn your head and look over your right shoulder.
Glance over your shoulder into the lane you want to enter.
Signal and change lanes immediately.
Look into your outside mirror only.
Explanation

Your mirrors have blind spots that could hide other vehicles. Even if you check your mirrors, a vehicle may be traveling in your blind spot, which could lead to a collision if you change lanes without properly looking. Turning your head to glance over your shoulder allows you to ensure that no vehicles are in the lane you're moving into, giving you a full view of the traffic situation and making your lane change safer.

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This question appears in the following DMV practice tests: