Also, if you have to be out in this, I suggest the following:
in your vehicle, make sure to carry water, food (I go with candy bars because they are small and packed with calories), a warm blanket or coat, and a flashlight. Also, it may be too late for this but make sure your vehicle has at least a half tank of gas. If you get stranded and have to wait before you are rescued these things will really help. The gas is important if your vehicle is in the ditch. The light and clothing/blanket are important if you have to walk or shelter in place. Also it's probably a good idea to make sure your phone has a full charge.
I have a story about the phone charge thing. When I was in grad school I was driving back to South Dakota after Thanksgiving break. About 20 miles before I was done with the drive, I hit black ice, vehicle did a 360 and ended up on its side in the median. I was an idiot 25 year old driving way too fast in an ice storm but aside from being really shaken didn't have a scratch on me. The people in a vehicle behind me pulled me out and told me they saw the whole thing. I called my mom to let her and my dad know what happened. I said that I was in an accident but was ok and my phone battery died. I didn't get a chance to tell them what happened until a trooper took me to a highway patrol station a few miles away for a friend to pick me up. Mom said that was the first cigarette she had in 5 years when she couldn't get ahold of me after my phone died.