When driving in fog, you should use your:

1. Low beam headlights. ✓
2. High beam headlights.
3. Parking lights.
4. Hazard flashers.

Answer: A. Low beam headlights.

Use your low beam headlights when you drive in fog.

Why this is the answer

The Texas handbook lists low beam headlights as the setting to use in fog, along with heavy rain, sleet, snow and dust. It also names four situations where low beams are the right choice, and fog is one of them. Nothing in the handbook tells you to switch to high beams, parking lights or flashers to see in fog, so the low beam setting is the one to remember and use.

Why the other answers are wrong

• B. High beam headlights. — High beams are not listed for fog driving; the handbook names low beams for fog, heavy rain, sleet, snow and dust.
• C. Parking lights. — Parking lights come up in the handbook only as something to leave on when you park on an unlighted highway at night, not as a setting for driving in fog.
• D. Hazard flashers. — Hazard flashers are not mentioned in the handbook for driving in fog or as a substitute for headlights.

Remember it

Think of fog as one item on a short list: fog, heavy rain, sleet, snow and dust all call for the low beam setting.