California Department of Transportation

Road Information - Winter Driving Tips - Winter Operations

Check Current Highway Conditions
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You can also call 1-800.427.7623 for current highway conditions.

Chain Requirements

  • R1: Chains are required - snow tread tires allowed.
  • R2: Chains are required on all vehicles except four wheel drive vehicles with snow tires on all four wheels.
  • R3: Chains are required - all vehicles - no exceptions.
  • R1 and R2 are the most common conditions. The highway is usually closed before an R3 condition is imposed.

Chain Control Placement Chart

The chain control chart for all vehicles is presented here in Adobe Portable Document format. If you do not have the most current Acrobat Reader from Adobe click here to download.