If weather or light conditions require you to have your lights on while driving:
- Use your parking lights.
- Use your high beams.
- Use your low beams. ✓
Answer: C. Use your low beams.
Use your low beams when weather or light conditions require you to have your lights on.
Why this is the answer
The handbook ties low beams to these conditions: adverse weather, rain, fog, and smoke, and it says to turn on low-beam headlights when you need your wipers. It also warns that high beams in fog reflect back and cause glare, and that driving with only parking lights is illegal. Those statements point to low beams as the choice that helps you see without creating glare in poor conditions.
Why the other answers are wrong
- A. Use your parking lights. — Parking lights alone are not enough; the handbook says it is illegal to drive using only parking lights and tells you not to rely on parking or fog lights in heavy fog.
- B. Use your high beams. — High beams are not the choice in these conditions; in heavy fog they reflect back and cause glare, and the handbook tells you to dim them for oncoming and followed vehicles.
Remember it
When rain, fog, or darkness makes you switch on lights, choose the setting that lights the road without bouncing glare back at you: low beams.