You must use your headlights when visibility is seriously reduced. What distance would be classed as seriously reduced?
- A 100 metres (328 feet) or less
- B 125 metres (408 feet) or less
- C 150 metres (490 feet) or less
- D 175 metres (572 feet) or less
Why this is the answer
It's advisable to use headlights when visibility is poor, but they must be used when visibility is seriously reduced. This is generally when you cannot see more than 100 metres (328 feet). Front and rear fog lights may also be used, but you must switch them off again when visibility improves.
Why the other answers don't fit
- B
- 125 metres (408 feet) or less — 125 metres is beyond the threshold the Highway Code sets.
- C
- 150 metres (490 feet) or less — 150 metres is further still.
- D
- 175 metres (572 feet) or less — 175 metres is nearly twice the figure.
Where this comes from
- Driving: the essential skills — section 3, section 11, section 12
- The Highway Code — rule 226
- LTD — section 1
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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