California Department of Transportation

Winter Operations

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Check Current Highway Conditions
When traveling in California try our toll free service
1-800-427-ROAD (7623). .

Caltrans Districts
Select your county

Planned Lane Closures

Live Traffic Cameras
Click a link below to go to the map of the traffic cameras from Sacramento to Lake Tahoe.
Traffic Cameras

Chain Requirement Levels and Traffic Control Definitions
Chains, traction devices or snow tires are required on the drive axle of all vehicles except four-wheel/all-wheel drive vehicles.
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.
Chains required - Chains or traction devices are required on all vehicles, no exceptions.
R-1 and R-2 are the most common chain controls. The highway will often be closed before an R-3 control is imposed.
Road Closed
Split Control - Chains or snow tread tire requirements are set at two separate points of the highway for different requirements. It is not uncommon to have R-1 conditions from point A to point B and R-2 conditions from point B to point C.
Truck Hold - During major storms when traffic flow is heavy, Caltrans may hold commercial tractor-trailer combinations at specific points below the snow line. These points typically are:
Eastbound I-80 at Applegate (east of Auburn, CA)
Westbound I-80 at Verdi, Nevada (west of Reno, NV)
Hold Traffic - Traffic is held due to spin outs and accidents. When the spinout or accident is cleared, traffic is then released.