1993 Cadillac Fleetwood Owner's Manual - Page 205

DRZKNG IN FOG, MISTAND HAZE Fog can occur with high humidity or heavy frost. It can be so mild that you can see throughit for several hundred feet (meters). Or might be it so thick that you can see only a few feet (meters) ahead. It come may suddenly to an otherwise clear road. Andcan be a major hazard. it When you drive into afog patch, your visibility will be reduced quickly. The biggest dangers are striking the vehicle ahead orbeing struck by the one behind. Try to "read" the density down the road.If the vehicle fog ahead starts to become clear or,at night, if the taillights are harder to less see, thefog is probably thickening. Slow down to give traffic behind you a chance to slow down. Everybody then has a better chance to avoid hitting the vehicle ahead. A patch of dense fog may extend only for afew feet (meters) or for miles (kilometers); you can'treally tell while you're in it. You can only treat the situation with extreme care. One common fog condition -- sometimes called mist or groundfog -- can happen in weather that seems perfect, especially at night or in the early morning in valley and low, marshy areas. You can be suddenly enveloped in thick, wet haze that may even coat your windshield. You can often spot these fog patches or mist layers with your headlights. But sometimes they can be waiting for you as you come over a hill or dip into shallow valley. a 191