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. Tire traction devices shall be constructed and assembled to provide sufficient structural integrity and to prevent accidental detachment from vehicles. Tire traction devices shall, at the time of manufacture or final assembly, bear a permanent impression indicating the name, initials or trademark of the assembling company or primary manufacturer, and the country in which the devices were manufactured or assembled in final form."

The Department of Transportation does not sell nor recommend specific brands of Tire Chains. It is best to check your vehicle manufacturers specifications for use of tire chains.

Types of Chain Controls
During the winter months motorists may encounter traction device controls in the mountain areas of California. When chain controls are established signs along side the road will be opened indicating the type of requirement. There are three requirements in California.

Requirement One (R1): Chains are required, snow tires are allowed.

Requirement Two (R2): Chains are required on all vehicles except four wheel drive vehicles with snow tires on all four wheels.

(NOTE: Four wheel drive vehicles must carry traction devices in chain control areas)

Requirement Three (R3): Chains are required on all vehicles, no exceptions.