Cadillac 1993 Fleetwood Owners Literature 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 through it for several hundred feet (meters). Or it might be
so thick that you can see only a few feet (meters) ahead. It may come
suddenly to an otherwise clear road. And it can be a major hazard.
When you drive into a fog patch, your visibility will be reduced quickly.
The biggest dangers are striking the vehicle ahead or being struck by the
one behind. Try to "read" the fog density down the road. If the vehicle
ahead starts to become less clear or, at night, if the taillights are harder to
see, the fog 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 a few feet (meters) or for miles
(kilometers); you can't really tell while you're in it. You can only treat the
situation with extreme care.
One common fog condition -- sometimes called mist or ground fog
--
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
a
shallow valley.
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