P-Land peeps still do the seasonal tire swap
Not only PL, but also NL, B, A, CH, F (in the mountains), I (Aosta Valley) and D. In D it will become compulsory to use winter tires, even when there is no snow. At the moment it is only compulsory when the weather situation asks for it. When you get caught driving without winter tires, it'll cost you 40 euro, when you endanger the other traffic, it'll cost you 80.
Don't forget that the rubber compound of a winter tire is different as well; it has a softer rubber compound than the summer tires.
The worst tyres to have on snow are the low profile tyres fitted to high performance cars , these are all but useless on snow , and its best to leave the car at home if the snow is coming down hard...for this type of car winter tyres are essential...
They are also more prone to aquaplanning.