You're stopped at the side of the road. What must you do if you'll be waiting there for some time?
- A Switch off the engine
- B Apply the steering lock
- C Switch off the radio
- D Use your headlights
Why this is the answer
If your vehicle is stationary and is likely to remain so for some time, you must switch off the engine unless you're stationary in traffic or diagnosing a fault.
Why the other answers don't fit
- B
- Apply the steering lock — The steering lock works when the key is out. It is not the requirement here.
- C
- Switch off the radio — The radio is not what is polluting.
- D
- Use your headlights — Headlights on a stationary car read as a moving vehicle.
Where this comes from
- Driving: the essential skills — section 17
- The Highway Code — rule 123
Rule numbers link to The Highway Code on gov.uk.
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: Car
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