Nugget Hoarder wrote:
>I see a lot of "I'm helpless come save me" type thinking going on here.
TeacherRO is the only one so far who touched on the right direction... snow shovel, jumper cables, flashy light, etc
Doesn't anyone prep for self-rescue anymore?

The opposite is true. People are providing lists of stuff to use outside the car, or if stuck in it all night. But the question was.
'Are you ready to spend a few hours, or more, in the car on a bitter cold day?'
Keeping warm is all you need. Only insulation is going to be of use. A cheap winter duvet (synthetic since you asked Dagny )will make all the difference. You have no wind, or rain, in a car and plenty of 'groud' insulation in the seats. I wouldn't be on ETS if I thought the rescue organisations could reach everyone in 10 minutes. But I'm prepared to NOT break the golden rule of a stranded vehicle. 'Don't leave the vehicle unless you KNOW you won't be found'.
qjs