GMC 2007 Sierra 1500 Pickup Owner's Manual page 403

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 Assist System (TAS),
it will improve your ability to accelerate when
driving on a slippery road. But you can turn the
TAS off if you ever need to. You should turn
the TAS off if your vehicle ever gets stuck in sand,
mud, ice, or snow. See If Your Vehicle is Stuck
in Sand, Mud, Ice, or Snow on page 406.
Even though your vehicle has TAS, you will want
to slow down and adjust your driving to the
road conditions. Under certain conditions, you may
want to turn the TAS off, such as when driving
through deep snow and loose gravel, to help
maintain vehicle motion at lower speeds.
See Traction Assist System (TAS) on page 363.
If you do not have TAS, accelerate gently. Try not
to break the fragile traction. If you accelerate
too fast, the drive wheels will spin and polish the
surface under the tires even more.
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