What does this sign mean?
- A Service area 30 miles ahead
- B Maximum speed 30 mph
- C Minimum speed 30 mph
- D Lay-by 30 miles ahead
Why this is the answer
This sign is shown where slow-moving vehicles would impede the flow of traffic; for example, in tunnels. However, if you need to slow down or even stop to avoid an incident or potential collision, you should do so.
Why the other answers don't fit
- A
- Service area 30 miles ahead — Services are signed on a blue or green rectangle.
- B
- Maximum speed 30 mph — A maximum limit is shown in a red circle.
- D
- Lay-by 30 miles ahead — A lay-by is shown on a rectangular information sign.
Where this comes from
- Driving: the essential skills — section 6
- The Highway Code — page 127
- Know Your Traffic Signs — page 23
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 , Lorry & Bus (LGV/PCV) , Motorcycle
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