This is a very locational consideration. In areas that regularly have snow and ice, everyone will have winter tires on their cars, studded if icing conditions are expected, or even snow chains, and a big crew of snowplow operators will keep the roads relatively clear of snow at all times. Starting with salting the roads in preparation for cold weather, and then sending out the crews the moment there is a few millimeters of snow on the road.

I have never experienced a "snow day", although there have been days with problematic traffic conditions due to snow. (Usually due to an experienced or unprepared driver going off the road on the first day of snow).