Question: What exactly is meant when signs say “Approved traction devices required”? Chains, obviously, but what else? – Peter, Tacoma
Answer: In addition to snow chains, traction devices approved by the Washington State Patrol include studded tires and traction tires.
If you’re not sure whether you have approved traction tires, look for a mountain symbol with a snowflake inside it on the tire sidewall. If you see the letters “M+S” (mud and snow) or “All Season,” that qualifies, too.
Check out WAC 204-24-040 for the nitty gritty details on tread design, but generally treads have to be at least one-eighth of an inch deep in the center of the tire, have an “aggressive tread pattern” and have shoulder lugs that stick out at least one-half inch from the side of the tire.
Rob Carson: 253-597-8693
rob.carson@thenewstribune.com
Have a question about traffic congestion, construction, spending or other transportation issues? Send it to traffic@thenewstribune.com. Include your name, hometown and daytime telephone number. We’ll answer as many as we can.
JOIN THE DISCUSSION | Register here
We welcome comments. Please keep them civil, short and to the point. ALL CAPS, spam, obscene, profane, abusive and off topic comments will be deleted. Repeat offenders will be blocked. Thanks for taking part — and abiding by these simple rules. A thorough explanation of rules of conduct can be found in our Terms of Service. If you have any questions, including why your comment may not be showing immediately after you submit it, be sure to visit the commenting FAQ.