When driving in fog, drivers should:

Slow down and drive cautiously.
Not use high beam headlights.
Use low beam headlights to better illuminate the road ahead.
All of the above.
Explanation

While driving in fog, use low beams or special fog lights to better illuminate the road ahead, and look for road edge markings to guide you. Fog reduces visibility and your ability to judge distances, so you must slow down and drive carefully. Driving in fog requires additional concentration and preparation.

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