always have a small bag of kitty litter in your trunk.
Kitty litter will give you traction if you ever get stuck on a patch of ice and will absorb snow if your tires are burried.
scraps of carpet help too.. but kitty litter is the most effective and takes up less space.
thick patches of ice for miles, is best driven over with semi deflated tires.
If your regular PSI on tires is 35, lower it to about 28. Basically enough to where the tire is fatter and closer to the ground then normal.
This causes the tread to be more pliable and makes it easier for the tire to drop ice and snow that gets packed in it , causing you to slide around.
Deep snow 2 or more feet, you may consider getting tire chains.
Keep a small shovel and an old credit card, or something thin and plastic in your car.
The credit card makes for easier ice scraping then a normal ice scraper and a shovel is always useful when you get burried in snow.