techniques needed, but I figure in a pile up, someone might.

As a kid we lived next to an intersection where there were terrible accidents - often head on- about 2 or 3 times a year. We saw too much of what a car accident can so to the human body.

Sometimes a tourniquet -used properly- can save someone's life.

ALSO, in a heavy snowstorm, stuck in your car, make sure to check that the tailpipe is clear.