GMC 1993 Suburban Owner's Manual page 223

AN48003
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: Turn
on
your
hazard 'flashers. Tie a red cloth to your vehicle to alert police that you've
been stopped by the snow. Put on extra clothing or wrap a blanket around
you. I f you have no blankets
or extra clothing, make body insulators from
newspapers, burlap bags, rags, floor mats-anything you can wrap around
yourself or tuck under your clothing to keep warm.
You can run the engine to keep warm, but be careful.
4-55