Tire Chains....and make sure you practice putting them on and taking them off before that big snow. You can even mimic realistic tire-chain weather conditions if you first stick your hands in ice water, then hold ice cubes in your hands, and THEN put gloves on, to properly prepare for putting the chains on.
heh heh...just kidding
Or, get studded snow tires--they were a big help to me. On icy roads when everyone else was slip=slidin' away, I made it all the way up the mountain to home.
Plus, in addition to your thermal blankets, you'll need to keep a spare pair of socks, warmup boots, thermal underwear, hat and gloves in the car. I used to roll most of that stuff up and tuck it in a pillow case in the back seat. And don't fergit yer flashlight....