When changing lanes on an expressway, always signal your intentions and:

Flash your headlights.
Signal for at least five seconds.
Sound your horn.
Slow down before moving to the next lane.
Explanation

Proper signaling can help prevent rear-end collisions. When changing lanes on an expressway, signal for at least five seconds before moving over. This gives other drivers enough time to see your intentions and adjust accordingly. Always check that the lane you plan to enter is clear, and never assume other drivers will yield or make room for you.

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