Buick 1994 Roadmaster Owner's Manual page 171

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
Turn on your low-beam headlights
--
not just your
parking lights
--
to help make you more visible to oth
Besides slowing down, allow some extra following
distance. And be especially careful when you pass
another vehicle. Allow yourself more clear room ahea
e Have good tires with proper tread depth.
.
' '
(See "Tires" in the Index.)
169