What’s the minimum legal depth of tread on the tyres of a trailer?
- A 1 mm
- B 1.6 mm
- C 2 mm
- D 2.2 mm
Why this is the answer
Your car or small van must have a minimum tread depth of 1.6 mm across the central three quarters of the width of the tyre and around the entire circumference. This also applies to the tyres on your trailer.
Why the other answers don't fit
- A
- 1 mm — 1 mm is the figure for large goods vehicles and motorcycles over 50 cc.
- C
- 2 mm — 2 mm is a sensible replacement point, not the legal minimum.
- D
- 2.2 mm — 2.2 mm corresponds to nothing in the regulations.
Where this comes from
- Driving: the essential skills — section 14
- The Highway Code — page 149
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: Driving Instructor (ADI Part 1)
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