Tire traction devices shall be constructed and assembled to provide sufficient structural integrity and to prevent accidental detachment from vehicles. Snow-tread tires can be identified by examining the sidewall of the tire where the letters MS, M/S, M+S or the words MUD AND SNOW have been stamped into the sidewall.Ģ Tire Traction Devices: The California Vehicle Code, Section 605 defines tire traction devices as follows: "Tire Traction Devices are devices or mechanisms having a composition and design capable of improving vehicle traction, braking and cornering ability upon snow or ice-covered surfaces. You must follow the directions on the signs posted for chain controls or any instructions given by Caltrans or CHP personnel at chain control check points, even if these are at variance with broadcast road condition reports or information contained herein.ġ Snow-tread Tires: The California Vehicle Code, Section 558 defines a snow-tread tire as follows, "A 'Snow-tread tire' is a tire which has a relatively deep and aggressive tread pattern compared with conventional passenger tread pattern". Some local areas may use variations of these designations. A highway will often be closed before an R-3 condition is imposed. R-1 and R-2 are the most common conditions. ![]() Truckers, see our Truck Chain Requirements page. Requirement 3 (R3): Chains or traction devices are required on all vehicles, no exceptions.NOTE: (Four-wheel/all-wheel drive vehicles must carry traction devices in chain control areas.) Requirement 2 (R2): Chains or traction devices are required on all vehicles except four-wheel/all-wheel drive vehicles with snow-tread tires on all four wheels.Trailers with brakes must have chains on at least one axle. ![]() All vehicles towing trailers must have chains on one drive axle. Chains must be carried by vehicles using snow tires.
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