I hate it that the city of Minneapolis, Minnesota can't be bothered to plow their city streets down to the pavement, but instead leave a 2-inch thick layer of packed slush/ice.....
I've never been to Minneapolis, but I've lived in a couple other snowy cities. Here's what happens.
The snow storm starts and the normal city traffic continues. The snow gets packed on the roads. The snow accumulates, and the plows come through,scraping down to the top of that hard packed layer. Eventually the storm stops and the plows clear down to the top of that hard-packed layer.
The salt and sand trucks come out, trying to melt the hard-packed layer. The top of the pack turns into that slush-ice mess. The plows try to remove it, but the next storm starts before its all moved.