When changing lanes, you should never:

Use your turn signal.
Change lanes abruptly.
Look over your shoulder to check blind spots.
Check to see if other drivers are moving into the same lane.
Explanation

Changing lanes abruptly can surprise other drivers and lead to accidents. It's important to signal your intention to change lanes, check your mirrors, look over your shoulders to make sure no one is in your vehicle’s blind spots, and merge smoothly into the new lane.

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This question appears in the following DMV practice tests: