When driving in fog, you should use your:

1. Fog lights only.
2. High beams.
3. Low beams. ✓

Answer: C. Low beams.

In fog, use your low-beam headlights.

Why this is the answer

The handbook's fog advice says to drive slowly and use low beams, because high beams bounce off the fog and create glare in your eyes. It also says never to drive using only your parking lights or fog lights, so low beams are the required choice. The headlight section repeats the same idea for bad weather: if you need your wipers for fog, rain, or snow, your low beams must be on.

Why the other answers are wrong

• A. Fog lights only. — The handbook explicitly says never to drive using only your parking or fog lights.
• B. High beams. — High beams reflect back off the fog and cause glare, which makes it harder to see.

Remember it

Fog bounces light back at you, so keep the beams low and your speed down.