I learned recently when looking for new winter tyres for it car that there are three-ish classifications for winter tyres: unstudded, studded, Nordics.

You will end up in a ditch without studded tyres here. In the winters we'll have a constant decimeter of ice on the pavements. The busy roads will have two tyre tracks between a 5-10 cm thick layer of ice and snow, which looks to lead to asphalt. But no, it's the absolutely most slippery ice you will ever come across.

The city buses stopped using studded tyres a couple of years ago for environmental reasons. You almost feel shame hitting the stop button, because the driver has to slow down well before the stop and takes a good minute for it to ~~get~~ slide up to speed again

For reference, somewhere in Västerbotten, Sweden