So much good advice here. Too bad those who need it won't see it...
anyway, I'm a damn good winter driver, if I do say so myself. I grew up in rural Pa down a half-mile dirt road, was already plowing it with a Cub Cadet at age 10, so knew all about traction/chains/power. My first car was a Saab 99 with illegal rally lights and OG 75-series Hakkapellitta snow tires direct from Finland. So basically nothing outside of black ice fazes me. My finest hour as a driver was going over the Col d'Aravis in a blizzard in full Sebastien Loeb mode drifting every corner with my wife covering her eyes and our two kids fast asleep in the back. Now we have a second home atop the Col de Romme so I get to go full on WRC all year long.
Anyway, all this boasting and bragging is to say the absolute best advice to winter driving is...nothing is so important, not even a powder day, that you shouldn't just turn around and go home, or stop for the day/night, if conditions are sketchy and you're not 100 percent confident you can safely turn AND stop. Especially with others in the car.