Driving in the fog can be one of the most dangerous driving situations you will encounter. Foggy weather is the number one cause of multi-car pile-ups. That being said, there are six things you can do to reduce your risk of getting into a crash.
First, and most important, slow down and increase your following distance. When you reduce your speed you will have more time to react in the limited visibility condition.
Second, make sure your lights are on and only use your low beams. Turning on your high beams will make the light reflect back and actually decrease your ability to see well. Activate your fog light if you have them, they will light up the sides of the roadway and help you to better see the road makers.