Final answer:
When faced with very dense fog, it is critical to reduce speed, use appropriate vehicle lights, maintain a greater distance from other vehicles, and possibly pull over to wait for conditions to improve for safety.
Step-by-step explanation:
When the fog becomes very dense, it's essential to prioritize safety. If you are driving, reduce your speed, turn on your fog lights or low beams, and maintain a greater distance from the vehicle in front of you. In extremely poor visibility conditions, it may be safest to pull over and wait for the fog to clear. Similar to how air traffic controllers use radar to navigate through clouds and smog, drivers must rely on their vehicle's instruments and cautious driving techniques to navigate through thick fog. Patience and cautiousness are vital in such low visibility to prevent accidents and ensure safety.