Buick 2007 LaCrosse Owner's Manual page 315

Driving on Snow or Ice
Most of the time, those places where the tires
meet the road probably have good traction.
However, if there is snow or ice between the tires
and the road, you can have a very slippery
situation. You will have a lot less traction, or grip,
and will need to be very careful.
What is the worst time for this? Wet ice. Very cold
snow or ice can be slick and hard to drive on.
But wet ice can be even more trouble because it
may offer the least traction of all. You can get
wet ice when it is about freezing, 32°F (0°C), and
freezing rain begins to fall. Try to avoid driving
on wet ice until salt and sand crews can get there.
Whatever the condition — smooth ice, packed,
blowing, or loose snow — drive with caution.
If you have the Traction Control System (TCS), it
improves your ability to accelerate when driving
on a slippery road. Even though your vehicle has
TCS, you will want to slow down and adjust
your driving to the road conditions. Under certain
conditions, you may want to turn the TCS off,
such as when driving through deep snow
and loose gravel, to help maintain vehicle motion
at lower speeds. See Traction Control System
(TCS) on page 294.
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