What is the correct procedure when driving in fog?

Answer: C — Reduce your speed and use low beam headlights.

When driving in fog, reducing your speed and using low beam headlights is essential for maintaining safety. Fog can severely limit visibility, making it difficult to see other vehicles, road signs, and potential hazards. By reducing your speed, you give yourself more time to react to any obstacles or changes in traffic conditions that may arise in the limited visibility of fog. Using low beam headlights is also critical because high beam headlights can reflect off the fog, creating a glare that makes it even harder to see. Low beams provide better illumination without causing a reflective effect that can decrease visibility. This strategic approach helps drivers navigate safely and prevents accidents while driving in such challenging weather conditions.