When changing lanes on a highway, drivers should:

Glance over their shoulder to check their blind spots.
Signal the lane change.
Check the rearview and outside mirrors.
All of the above.
Explanation

When changing lanes on a highway, signal your intention to change lanes, giving ample notice to other drivers. Then, check your rearview and outside mirrors to assess the traffic situation. Finally, glance over your shoulder in the direction you intend to move, ensuring there are no vehicles in your blind spots.

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This question appears in the following DMV practice tests: