Gasoline would I suppose freeze at low enough temperatures, but not the temps we humans experience.

No the cars don't freeze, but when it is very cold out, the oil and gas are thicker - more viscous - so it is best to let the car warm up for a minute to be things moving.

The reason you want a full tank of gas when it's really cold out is so there's less air in your gas tank. Lots of air means condensation can form, and you can end up with water in the gas lines - not a good thing.

Being outside is fine, when it gets very cold, you have to be extra vigilant about keeping your skin covered so you don't risk frostbite, but people aren't running around in shorts in zero-degree weather anyway!

As cyber-sibes mentioned, our road crews are prepared for snow and ice, so if you can wait a bit, the roads aren't bad to drive one, and people - except for newcomers, are used to driving in snow. And when there's LOTS of snow, well, we just all shovel. A lot.