GMC 2002 Envoy - Manual (Page 265)

4-41
What’s 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’s 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, keep the system on. It will
improve your ability to accelerate when driving on a
slippery road. But you can turn the traction system
off if you ever need to. You should turn the system off
if your vehicle ever gets stuck in sand, mud, ice or snow.
See “Rocking Your Vehicle” in the Index. Even though
your vehicle has a traction system, you’ll want to slow
down and adjust your driving to the road conditions.
See “Traction Assist System” in the Index.
If you don’t have a traction system, accelerate gently.
Try not to break the gentle traction. If you accelerate
too fast, the drive wheels will spin and polish the surface
under the tires even more.