You are driving on a four-lane highway. A slow moving vehicle is in your lane. Traffic is moderate. Before changing lanes you must:

Make sure your blindspot is clear.
Make sure that there is sufficient room in traffic to make the move.
Signal your intentions for at least 100 feet.
All of the above.
Explanation

Each of these actions ensures safe and efficient lane changes on a four-lane highway. Checking for sufficient room in traffic prevents disruptions or accidents, while verifying blind spots ensures there are no hidden vehicles, reducing the risk of accidents during a lane change. Signaling well in advance effectively communicates your intentions to other drivers.

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This question appears in the following DMV practice tests: