Tyres on cars, light vans and trailers must have a continuous tread depth of at least 1.6 mm. How much of the tyre must have this depth of tread?
- A The central three-quarters of the width of the tyre
- B The outer edges of the tyre
- C The whole width of the tyre
- D The central half of the width of the tyre
Why this is the answer
Your safety and that of others may depend on the condition of your tyres. You must check that they're correctly inflated and have sufficient tread depth. The legal minimum tread depth for cars is 1.6 mm. This depth should be across the central three-quarters of the breadth of the tyre and around the entire circumference.
Why the other answers don't fit
- B
- The outer edges of the tyre — The outer edges are outside the measured band.
- C
- The whole width of the tyre — The whole width is more than the regulation asks for.
- D
- The central half of the width of the tyre — The central half is less than the measured band.
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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