When should you use hazard warning lights?
- A To warn other drivers that you're towing
- B When approaching queuing traffic on a motorway
- C When parked illegally on a busy road
- D To thank a driver for giving way to you
Why this is the answer
The only time you may use hazard warning lights while driving is when you're on an unrestricted dual carriageway or motorway and you want to warn other drivers of a hazard or obstruction ahead. Only use them for long enough to make sure your warning is seen.
Why the other answers don't fit
- A
- To warn other drivers that you're towing — Towing is shown by the vehicles themselves, not by hazard lights.
- C
- When parked illegally on a busy road — Hazard lights do not make illegal parking lawful.
- D
- To thank a driver for giving way to you — They are a warning, not a thank-you.
Where this question comes from
The question, its options and the explanation are reproduced word for word from the DVSA revision question bank under licence. The licence requires them to appear unaltered, so we cannot reword them and neither can anyone else — that is why you will meet the same wording on other sites. Everything else on this page is written by Theory Hub: the explanation of why each wrong answer is wrong, the topic guide and the revision notes.
Asked in: Lorry & Bus (LGV/PCV)
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