Before changing lanes on a multi-lane highway, drivers should:

Reduce their speed.
Turn on their headlights.
Sound their horn.
Check their mirrors and blind spots.
Explanation

Before changing lanes on a multi-lane highway, look in your rearview and side mirrors and quickly check your blind spots to make sure there are no vehicles in the lane you want to enter, and that no vehicle is about to pass you. Signal early enough so other drivers will know your plans in advance.

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