Buick 1994 LeSabre Owner's Manual page 166

Hydroplaning
Hydroplaning is dangerous. So much water can build up
under your tires that they can actually ride on the water.
This can happen if the road is wet enough and you're
going fast enough. When your vehicle is hydroplaning,
it has little or no contact with the road.
Hydroplaning doesn't happen often. But it can if your
tires haven't much tread or if the pressure in one or
more is low. It can happen if a lot of water is standing
on the road.
If you
can
see
reflections from trees,
telephone poles, or other vehicles, and raindrops
"dimple" the water's surface, there could be
hydroplaning.
Hydroplaning usually happens at higher speeds. There
just isn't a hard and fast rule about hydroplaning. The
best advice is to slow down when it is raining.
Some Other Rainy Weather Tips
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Turn on your low-beam headlights
--
not just your
parking lights -- to help make you more visible to
others.
Besides slowing down, allow some extra following
distance. And be especially careful when you pass
another vehicle. Allow yourself more clear room
ahead, and be prepared to have your view restricted
by road spray.
Have good tires with proper tread depth. (See
"Tires'' in the Index.)
164