I think if winter tires were mandatory, it would increase road efficiency in conditions like this. It just really sucks to be stuck behind people who take an entire green light to get through an icy intersection. Being blocked by cars that can't get up mild inclines also sucks. This has been the biggest reason for the delays on my drive and not necessarily traffic accidents. Yes, you can get around safely with all-seasons, but the price is paid in traffic inefficiencies. I wonder if there are studies on this.
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