It is important to consider the fact that most winter tires will also be subjected to mud, and wet and dry pavement conditions. Some winter tires have provisions to add tire studs for ice winter driving. Tire studs are installed with a special tool by tire shops in colder regions. They work well for combating the dreaded black ice that causes so many accidents each year, but studs are illegal in some regions because they can cause damage to road surfaces. Be sure to check your local government regulations before adding tire studs.