Saturn 2007 Ion Owner's Manual page 246

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.
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Whatever the condition — smooth ice, packed,
blowing, or loose snow — drive with caution.
If you have the Enhanced Traction System (ETS),
it will improve your ability to accelerate when
driving on a slippery road. Even if your vehicle has
ETS, you will want to slow down and adjust
your driving to the road conditions. Under certain
conditions, you may want to turn the ETS off,
such as when driving through deep snow
and loose gravel, to help maintain vehicle motion
at lower speeds. See Enhanced Traction
System (ETS) on page 226.
If you do not have ETS, 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.