When driving in fog, you should use
- parking lights.
- parking lights and high-beam headlights.
- high-beam headlights.
- low-beam headlights. ✓
Answer: D. low-beam headlights.
In fog you should drive with your low-beam headlights on.
Why this is the answer
The handbook passages don't talk about fog directly, but they do settle which lights are for driving. Parking lights are for parking only, and driving at night on parking lights alone is illegal. The handbook also has you drop from high beam to low beam near other vehicles so you don't blind them. Putting those together, low beams are the setting meant for seeing the road while driving without throwing glare, which is why they're the answer here rather than high beams or parking lights.
Why the other answers are wrong
- A. parking lights. — Parking lights are described in the handbook as being for parking only, and driving with just those lights is illegal.
- B. parking lights and high-beam headlights. — That combines a parking-only light with high beams, and the handbook has you switch away from high beam to avoid glare on other drivers.
- C. high-beam headlights. — High beams are the setting the handbook tells you to switch off when other vehicles are around, so they don't reduce glare.
Remember it
Parking lights are for standing still, high beams are for empty road ahead, so fog calls for the in-between setting: low beam.