Because I was the only vehicle with fog lights, I was able to keep on driving. The other cars that had pulled over to the side of the road followed me, and soon I had a convoy of a few dozen cars following obediently behind me. At one stage I got a little bit lost, and veered left towards Sublime Point Lookout. Of course, in the interest of safety, I headed down Bulli Pass and once we got out of the fog, the other more powerful vehicles overtook me and vanished into the night with a cheery wave. This cloud is formed near the ground, and reduces your visibility to less than one kilometre.
Air can carry a certain amount of water vapour.
As the temperature of the air drops, so does the amount of water vapour it can carry. As moist air cools, tiny droplets of water vapour pop into existence. They do this on microscopic particles in the air - ocean spray, products of combustion such as soot, or even trace chemicals coming from random reactions in the atmosphere. In fog, there are several hundred droplets in each cubic centimetre. There are several different types of fog.