California Regulations and Info

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

Requirement One (R1): Chains, traction devices or snow tires are required on the drive axle of all vehicles except four wheel/ all wheel drive vehicles.

Requirement Two (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.
(NOTE: Four wheel/all wheel drive vehicles must carry traction devices in chain control areas.)

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

Find out more information at the official website

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Montana Regulations

If the department of transportation determines at any time that dangerous or unsafe conditions on a highway require particular tires, tire chains, or traction equipment for vehicles in addition to or beyond the ordinary pneumatic rubber tires, the department may establish the following recommendations or requirements with respect to the use of the equipment for all vehicles using the highway:


1. chains or other approved traction devices recommended for driver wheels;
2. chains or other approved traction devices required for driver wheels; or
3. chains required for driver wheels


Find out more information HERE

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Colorado Chain Regulations - NEW

Colorado chain law applies to every state highway, federal highway and interstate throughout the state. When the chain law is in effect, drivers will see signs along the roadway indicating which vehicles should chain-up. In some areas of the state, lighted variable message signs will also alert drivers of the chain-up information.
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Metal chains must consist of two circular metal loops, one on each side of the tire, connected by not less than nine evenly spaced chains across the tread. Commercial vehicles having four or more drive wheels must chain four wheels. Dual tire chains are acceptable.

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