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Question:

If fog becomes so thick that visibility is reduced to near zero, what should you do?

A Pull over and wait for visibility to improve.
Explaination

When driving in fog, slow down and use your low-beam headlights. You may also use your fog lights if your vehicle is equipped with them. However, if visibility is reduced to near zero, pull as far off the road as possible and remain stopped until conditions improve. Remember: If you can't see, you can't drive.