What precaution should you take before driving in fog?

• A. Use high-beam headlights
• B. Reduce speed and use low-beam headlights
• C. Turn on hazard lights
• D. Keep both windows down

Answer: (B)

Driving in fog requires particular precautions due to the reduced visibility conditions. Using low-beam headlights is the best practice in foggy conditions because they are designed to illuminate the road directly in front of you without reflecting off the fog and creating glare. High-beam headlights can reflect off the fog and actually reduce visibility further, making it harder to see the road and any obstacles.

Additionally, reducing speed is crucial in fog since it allows for better reaction times to unexpected situations. Slowing down provides the driver with more time to see and respond to other vehicles, pedestrians, or changes in the road conditions that may not be visible until very close.

While turning on hazard lights might signal to other drivers that you are having trouble or moving slower, it doesn't aid in visibility for the driver themselves. Keeping both windows down can also be distracting or expose the driver to outside conditions that worsen visibility, rather than helping them navigate safely through fog. Therefore, the combination of reducing speed and utilizing low-beam headlights is the most effective method to enhance safety in foggy driving conditions.