I think in some sense requiring winter tires is optimal, but I think the heavily car centric transportation introduces other issues. Say you require winter tire

I think in some sense requiring winter tires is optimal, but I think the heavily car centric transportation introduces other issues. Say you require winter tires, someone loses their job, and now they can’t afford to get the tires or the maintenance to swap them on. Now being poor additionally means they can’t travel very well during the winter, which may even prevent them from finding new employment.