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When driving in the left lane of a four-lane highway, when should you use your turn signal?

  1. When merging into the lane

  2. When making turns

  3. When merging out of the lane

  4. When changing speed

The correct answer is: When merging out of the lane

Using your turn signal when merging out of the left lane is important for communication and safety. Option A is incorrect because you should use your turn signal when merging into the left lane, not when merging out of it. Option B is incorrect because you should only use your turn signal when making turns, not when driving straight in the left lane. Option D is incorrect because using a turn signal does not indicate a change in speed, rather it signals a change in direction. Therefore, the correct answer is C - when merging out of the left lane.