You're overtaking a lorry. What should you do if you see the driver flash their headlights?

Possible Answers:

a. Move back to the left when you judge it's safe to do so

b. Take their signal to mean it's safe to move back to the left

c. Stop; there must be something wrong with your vehicle

d. Flash your hazard warning lights and move back to the left

Think you know the answer to this theory test question?

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