You should use your headlights when you can't see anything farther than
- 150 metres ✓
- 250 metres
- 300 metres
- 200 metres
Answer: A. 150 metres
You must turn on your headlights when you can't see more than 150 metres ahead.
Why this is the answer
The handbook says headlights are required whenever visibility drops below 150 metres, and it gives fog and heavy rain as examples. Headlights help other drivers see you and help you see the road when conditions cut down how far you can see. So the distance tied to the headlight rule is 150 metres, not a longer one. The same chapter also mentions dimming your high beams within 150 metres of another vehicle, but that is a separate rule about high beams.
Why the other answers are wrong
- B. 250 metres — 250 metres is longer than the distance the handbook attaches to the headlight rule, which is 150 metres.
- C. 300 metres — 300 metres does not appear in the handbook as a visibility distance for turning on headlights.
- D. 200 metres — 200 metres is not the figure the handbook gives; it sets the headlight threshold at 150 metres.
Remember it
Remember the 150 figure twice over: it is both how far you can see before headlights are required and how close a vehicle can be before you dim your high beams.