Buick 2005 Rainier Owner's Manual page 283

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 traction assist, it will improve your ability to
accelerate when driving on a slippery road. But you
can turn the traction system off if your vehicle ever gets
stuck in sand, mud, ice or snow. See If You Are
Stuck: In Sand, Mud, Ice or Snow on page 4-42. Even
though your vehicle has a traction system, you will want
to slow down and adjust your driving to the road
conditions. Under certain conditions, you may want to
turn the traction assist system 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 4-8.
If you do not have a traction system, 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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