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- Page 217

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Tie a red cloth to your vehicle to alert police that
you’ve been stopped by the snow.

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Put on extra clothing or wrap a blanket around you.
If you have no blankets or extra clothing, make body
insulators from newspapers, burlap bags, rags, floor
mats 

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 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.

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 away snow from
around the base of your vehicle, especially any
that is blocking your exhaust pipe. And check
around again from time to time to be sure snow
doesn’t collect there.

Open a window just a little on the side of the
vehicle that’s away from the wind. This will help
keep CO out.