Which action is not appropriate when visibility is reduced by fog?

Which action is not appropriate when visibility is reduced by fog?

• A. Use appropriate lights
• B. Reduce speed
• C. Increase following distance
• D. Use high beam headlights

Answer: (D)

When visibility is cut by fog, you adjust your driving to maintain control and give yourself more reaction time. Use lights that improve visibility without creating glare—switch to low beams (and fog lights if equipped) rather than high beams. High beams bounce off the fog and create a bright, blurred glare that hides obstacles instead of revealing them, so they’re not appropriate in foggy conditions. At the same time, reducing speed helps you see hazards sooner, and increasing the distance to the vehicle ahead gives you more time to react if you can’t see far enough ahead.

When visibility is cut by fog, you adjust your driving to maintain control and give yourself more reaction time. Use lights that improve visibility without creating glare—switch to low beams (and fog lights if equipped) rather than high beams. High beams bounce off the fog and create a bright, blurred glare that hides obstacles instead of revealing them, so they’re not appropriate in foggy conditions. At the same time, reducing speed helps you see hazards sooner, and increasing the distance to the vehicle ahead gives you more time to react if you can’t see far enough ahead.