When driving under low-visibility conditions due to fog, you should:
- Turn on your high beam headlights.
- Slow down and use your low beam headlights. ✓
- Increase your speed so you do not cause an accident.
Answer: B. Slow down and use your low beam headlights.
Slow down and use your low beam headlights in fog.
Why this is the answer
The handbook's fog, rain, and snow section says high beams reflect the precipitation back and make it harder to see, so you should keep your headlights on low beam for better visibility. It also tells you to reduce your speed in these conditions. Turning on headlights in fog is covered elsewhere, and low beam is the setting the manual recommends for fog. Together, slowing down and using low beams match what the handbook says to do when fog limits visibility.
Why the other answers are wrong
- A. Turn on your high beam headlights. — High beams are the wrong choice because the handbook says they reflect rain, fog, and snow back and make it harder for you to see.
- C. Increase your speed so you do not cause an accident. — Increasing speed goes against the handbook's instruction to reduce your speed when rain, fog, or snow makes visibility poor.
Remember it
In fog, think low and slow: low beams, slower speed.