What is the correct action to take when you encounter heavy fog while driving?

When driving in heavy fog, using low-beam headlights is the correct action to take. Low-beam headlights are designed to illuminate the road directly in front of your vehicle without causing significant glare. In fog, high-beam headlights can reflect off the moisture in the air, creating a wall of light that can further reduce visibility. Keeping your headlights off is also not advisable, as it would make your vehicle less visible to others and hinder your ability to see the road clearly.

Low-beam headlights help ensure that you can see the road and any obstacles ahead without compromising visibility due to glare. This approach contributes to safer driving conditions when navigating through foggy weather.