I think I remember reading it takes MNDOT approximately 4 hours to plow all the major highways in the metro. So, if it's snowing an inch an hour (or even a half inch an hour), during the peak of the storm, you're looking at 2-4" by the time the plows can make another pass. If it's in the mid-to-upper 20s, this isn't such a big deal, since treated roads will simply make things slushy until the plows can come back around and scrape down to the pavement. This time around, it was only in the upper teens, so the snow melting efforts were basically useless.
The side streets were pure **** this morning; in order to make a turn, I had to gun it (and nearly spun out in the process). Had I not done that, I would've gotten stuck as the plows hadn't gone through yet (saw somebody get stuck trying to turn onto the road I was turning off of).