What can cab-mounted wind deflectors reduce?
- A Journey times
- B Load capacity
- C Tyre wear
- D Fuel consumption
Why this is the answer
A wind deflector redirects the air flow around the vehicle. This reduces the amount of energy required to drive the vehicle forward and so saves fuel.
Why the other answers don't fit
- A
- Journey times — A smoother shape saves fuel; it does not make the vehicle faster.
- B
- Load capacity — Nothing on the cab roof changes how much you can carry.
- C
- Tyre wear — Tyres wear from the road and the load, not from air over the cab.
Where this comes from
- Driving Goods Vehicles — section 13
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: Lorry & Bus (LGV/PCV)
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