Which of the following is NOT an appropriate action when driving in fog?

Using high beam headlights in foggy conditions is not appropriate because the light from high beams can reflect off the fog, rain, or snow, creating a glare that reduces visibility instead of improving it. This reflection can make it more difficult to see the road or other vehicles, leading to potentially dangerous driving situations.

In contrast, low beam headlights are designed to project a shorter, wider beam of light that helps illuminate the road directly in front of the vehicle while minimizing the amount of light that bounces back from the fog. Driving slowly and cautiously is essential in fog since reduced visibility can lead to sudden obstacles or changes in road conditions. Maintaining a safe distance from the vehicle ahead allows for ample reaction time if the vehicle in front stops suddenly.