How will a roof rack affect your car?
- A There will be less wind noise
- B The engine will use more oil
- C The car will accelerate faster
- D Fuel consumption will increase
Why this is the answer
A roof rack increases your car's wind resistance. This will cause an increase in fuel consumption, so you should remove it when it’s not being used. An aerodynamically designed roof rack or box will help reduce wind resistance to a minimum, but the rack or box should still be removed when it’s not in use.
Why the other answers don't fit
- A
- There will be less wind noise — A rack adds turbulence, so there is more wind noise, not less.
- B
- The engine will use more oil — Oil consumption is unaffected by what is on the roof.
- C
- The car will accelerate faster — Extra weight and drag slow the car down.
Where this comes from
- Driving: the essential skills — section 17
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
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