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What action is necessary when changing lanes?

  1. No need to check mirrors

  2. Signal, check mirrors, and ensure it's safe

  3. Change lanes without signaling

  4. Speed up to merge quicker

The correct answer is: Signal, check mirrors, and ensure it's safe

When changing lanes, the necessary action involves signaling your intention, checking your mirrors, and ensuring that it is safe to make the maneuver. Signaling is crucial because it communicates your intended action to other drivers, allowing them to anticipate your movement. Checking mirrors helps you see any vehicles that may be in your blind spots, making it vital to ensure there are no obstacles or other drivers that could cause an accident. Additionally, verifying that it is safe to change lanes means you are making an informed decision, minimizing the risk of collisions. This comprehensive approach promotes road safety and responsible driving behavior.