GMC 2002 Envoy - Manual (Page 266)

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Your anti - lock brakes improve your vehicle’s stability
when you make a hard stop on a slippery road. Even
though you have an anti
- lock braking system, you’ll
want to begin stopping sooner than you would on dry
pavement. See “Anti
- Lock” in the Index.
D Allow greater following distance on any
slippery road.
D Watch for slippery spots. The road might be fine
until you hit a spot that’s covered with ice. On an
otherwise clear road, ice patches may appear in
shaded areas where the sun can’t reach: around
clumps of trees, behind buildings or under bridges.
Sometimes the surface of a curve or an overpass may
remain icy when the surrounding roads are clear. If
you see a patch of ice ahead of you, brake before you
are on it. Try not to brake while you’re actually on
the ice, and avoid sudden steering maneuvers.
If You’re Caught in a Blizzard
If you are stopped by heavy snow, you could be in a serious
situation. You should probably stay with your vehicle
unless you know for sure that you are near help and you can
hike through the snow. Here are some things to do to
summon help and keep yourself and your passengers safe:
D Turn on your hazard flashers.
D Tie a red cloth to your vehicle to alert police that
you’ve been stopped by the snow.