1996 Cadillac DeVille Owner's Manual - Page 209

Tie a red clothto your vehicle to alert police that you've been stopped by the snow. Put on extra clothingor wrap a blanket around you. or If you have no blankets extra clothing,make body insulators from newspapers, burlapbags, rags, floor mats -- anything you can wrap around yourself or tuck underyour clothing to keep warm. A CAUTION: Snow can trap exhaust gases under your vehicle. This can cause deadly CO (carbon monoxide) gas to get inside. CO could overcome you and kill you. You can't see it or smell it, so you might not know it is in your vehicle. Clear awaysnow from around thebase of your vehicle, especiallyany that is blockingyour exhaustpipe. And check around again from time to time to be suresnow doesn't collect there. Open a window just a little on the side of the vehicle that's away from thewind. This will help keep CO out. You can run the engine to keep warm, but be careful. 4-28