Dear Citizens of the Midwest,
When you head out to drive your vehicles and there are white flakes falling from the sky, that's a good indication that you should travel at a slower speed because the road conditions are likely to be sub-par at best. That does not mean you should cut off a semi truck. Doing that will often result in a jack-knifed semi closing multiple lanes of a major highway (which is the situation we have on the east side of the city this afternoon).
Semi trucks, this goes for you as well. Don't think you're somehow immune to wrecks. When you jack-knife your trailer all on your own and 15 cars pile into you because they have nowhere to go, that's a bad thing. That may result in the total closing of a major highway (which is the situation we have on the west side of the city this afternoon).
In summary, if you are in a vehicle and wintry precipitation is falling, slow down. All of the people who have to drive home after work will thank you later.