A brief google search brought up a PDF for winter tires from the traffic injury reduction foundation, with the basic conclusion that yes, they are better, but u

A brief google search brought up a PDF for winter tires from the traffic injury reduction foundation, with the basic conclusion that yes, they are better, but updated studies are needed for exact numbers. Walk into any car tire store, and you will see displays for winter tires claiming anywhere from 25-35% improved stopping distance. Of course, with less frequent plowing, salting and sanding, these numbers likely go out the window. They get you better stopping distance, but they aren't magic and it is still worse than all season tires on a dry, summer road. If you want safer winter roads, you use salt and / or sand and plow every time significant accumulation of snow occurs.