Turn on the fog lights.
(There’s usually a switch on the dashboard or on the same lever that controls the turn signal, but you can also use low beams in a pinch.) The lights are yellow, which cuts through fog better than white lamps do, and they’re low to the ground so the beams illuminate the road well.
Pump the brakes before entering a fog bank.
This alerts the cars trailing you to back off. If you wait to apply the brakes until you’re in the thick of it, you could get hit from behind.
Slow down before a hill.
Be extra-cautious driving over the crest of a hill because you won’t be able to see if there’s another car stopped there.