From passenger cars and pickups or large commercial trucks or buses, we answer the most common questions about traction devices here. Read Washington's standards (Chapter 204-24 WAC) for tire chains, studded tires, and their use and approval.

1. What qualifies as a traction tire? Do mud and snow tires qualify?
   Tires that are labeled snow tire, all-season, all-weather, or studded (must be labeled M&S on the sidewall) qualify so long as they meet the standards set in WAC 204-24-040 Traction Devices.

2. When can I use studded tires?
   Studded tires are approved for use from November 1 to March 31. The Washington State Department of Transportation (WSDOT) determines additional periods in which they can be used. Studded tires are not allowed on vehicles over 10,000 pounds. Click here to view WSDOT's studded tire page.

3. I drive a vehicle with studded tires. When DOT requires chains to be put on, do I need them with studded tires?
   Yes. Studded tires are not a substitute for chains.

4. I have an all-wheel or four-wheel drive vehicle. When "Chains Required" signs are posted, do I have to use chains?
   No. All-wheel drive vehicles are exempt from chain requirements when all wheels are in gear and are equipped with approved traction devices, provided that tire chains for at least one set of drive tires are carried in the vehicle. For more information, read WAC 204-24-050 .

5. I can't use regular cable chains because there's not enough clearance in the wheel well. What other approved traction devices can I use?
   First, it is recommended you consult the vehicle owner's manual to see what the manufacturer suggests. You can use a device which locks to the drive wheels of a vehicle with traction arms that are held in an operational position by a hub assembly mounted to special wheel nuts/bolts installed on each drive wheel or an advanced traction device made from high-performance flexible polyurethanes intended for use on passenger-type vehicles. They are approved for use when "Chains Required" signs are posted.

6. I drive a vehicle and/or combination over 10,000 pound gross vehicle weight (GVW). Can you give me more details about chain requirements?
   The Washington State Patrol's Commercial Vehicle Division (CVD) has a brochure that illustrates chaining 2-4, 5, and 6 or more axles. It is available at all Washington State Patrol offices and weigh stations. Please visit the Commercial Vehicle Division page for additonal information.

For answers to questions about approved traction devices and other equipment for passenger cars, vans, and pickups, e-mail us at equipment@wsp.wa.gov.