Which road surface may cause an anti-lock braking system (ABS) to be less effective?
- A A dry surface
- B A loose surface
- C A firm surface
- D A damp surface
Why this is the answer
If the road surface is loose, it's possible for the loose surfaces to slide over each other. A vehicle's tyres may grip the surface layer but this may slide across a lower layer. ABS would be less effective in this situation.
Why the other answers don't fit
- A
- A dry surface — A dry surface is where ABS works best.
- C
- A firm surface — A firm surface gives the tyres something to grip.
- D
- A damp surface — A damp surface is where ABS earns its keep.
Where this comes from
- Driving: the essential skills — section 5
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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