One of things I've always remembered is a chip bag turned inside out will work for a reflector, as the lining is almost always a shiny silver; carry a "space blanket" with you as it is warm and shiny; stay put as you said, Rapaire; and conserve whatever you do have. Best of all would be to have a GPS so that you can be found or cellphone or whatever it is that can help them find you.

Oh, and another one I read about, unscrewing the headlight rims on a vehicle, pull the headlights out, with wires still attached, turn them on and wave them pointing up in the sky for search planes to see. Also, burning a spare tire will set up an awful smoke. If you go off the road into deep water, keep your windows rolled up until the car settles, to conserve the oxygen, then take a deep breath, roll down the window and get out as fast as you can , bobbing to the surface, at least that's the theory I read years and years ago. And, that was before power windows, so YMMV.