2003 GMC Envoy Owner's Manual - Page 274

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 Braking on page 4-5. Allow greater following distance on any slippery road. 0 If You're Caught in a Blizzard 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 are stopped by heavy snow, you could be in 2 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. 4-4 1