CA
California R-1, R-2 and R-3 chain controls
R-1, R-2 and R-3 are escalating Caltrans traction-control levels. The posted roadside requirement and Caltrans route report are authoritative.
Prepare before the chain-up area
Snow-chain requirements and control levels
Understand the posted control, match a device to your tire and vehicle, then verify the current restriction with the state DOT. This guide is educational, not legal or fitment advice.
What does chain control mean?
A chain control is a temporary road restriction that requires specified vehicles to use tire chains or another approved traction device. The exact rule depends on the state, posted control level, vehicle and tires; the current DOT notice and roadside signs control.
State requirements and fitment guides
CO
Colorado Code 15 and Code 16 explained
Colorado passenger-vehicle traction law and commercial-vehicle chain law use different requirements. Confirm the active code on COtrip.
WA
Washington chain requirements
Washington pass notices distinguish chains required, traction tires advised or required, and vehicle-specific exceptions.
Fitment
AutoSock vs tire chains
Textile traction devices can be easier to fit, but acceptance and suitability vary by jurisdiction, vehicle and posted control.
Fitment
How to match tire chains to tire size
A safe chain choice starts with the complete sidewall size and the vehicle maker's clearance rules.
Fitment
Commercial-vehicle chain basics
Commercial chain placement, carry dates and exemptions vary by state and configuration; this overview is not a substitute for the governing DOT diagram.
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