Buick 1994 Regal Owner's Manual page 156

The heavier the rain, the harder it is to see. Even if your
windshield wiper blades are in good shape, a heavy rain
can make it harder to see road signs and traffic signals,
pavement markings, the edge of the road, and even
people walking.
It's wise to keep your wiping equipment in good shape
and keep your windshield washer tank filled. Replace
your windshield wiper inserts when they show signs of
streaking or missing areas on the windshield, or when
strips of rubber start to separate from the inserts.
Driving too fast through large water puddles or even
going through some car washes can cause problems, too.
The water may affect your brakes. Try to avoid puddles.
But if you can't, try to slow down before you hit them.
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
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