On Wednesday, studded tires will be legal on Washington roads. State laws permit their use from Nov. 1 through May. 31. The metal studs embedded within the tread are designed to dig into ice, which provides added traction but according to the DOT also result in significant road damage which is estimated to be between $20 million and $29 million annually. The agency suggest drivers should talk to tire dealers about stud-free traction tires that are legal for year-round use. Chains are still required when called for by authorities even with studded tires.