Fog can greatly reduce the visibility of other vehicles, pedestrians, and traffic signals. When driving in fog, you should:

1. Drive cautiously and reduce your speed.
2. Not use your high beam headlights.
3. Use low beam headlights to better illuminate the road and objects.
4. All of the above. ✓

Answer: D. All of the above.

Use every listed action: slow down and drive cautiously, keep high beams off, and use low beam headlights in fog.

Why this is the answer

The Texas handbook says to use low beam headlights when driving in fog, and it warns that your speed should let you stop within the distance your headlights light. Since low beams are the setting the handbook names for fog, high beams are not the choice there. Slowing down fits the same visibility problem, because fog limits how far you can see. The bank answer groups these fog-driving precautions together.

Why the other answers are wrong

• A. Drive cautiously and reduce your speed. — Slowing down and being cautious is only one part of the fog response; it leaves out the headlight setting the handbook names.
• B. Not use your high beam headlights. — Avoiding high beams alone is incomplete because the handbook specifically directs you to use low beams in fog, not just to avoid high beams.
• C. Use low beam headlights to better illuminate the road and objects. — Using low beams is necessary, but this choice by itself leaves out the cautious, reduced-speed driving that the full answer includes.

Remember it

In fog, think low and slow: low beams on, speed down.