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OP lives in the Bay Area like I do. If you go to Tahoe then you are required to have a set of chains in the car regardless of 4x4, snow tires, etc. There are 3 levels of chain controls and R2 is common on I-80. R3 is rare for interstates but can happen on local highways/roads.
Chains are required under the following conditions:
Requirement 1 (R-1): Chains are required on all vehicles except passenger vehicles and light-duty trucks under 6,000 pounds gross weight and equipped with snow tires on at least two drive wheels. Chains must be carried by vehicles using snow tires. All vehicles towing trailers must have chains on one drive axle. Trailers with brakes must have chains on at least one axle.
Requirement 2 (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 3 (R3): Chains or traction devices are required on all vehicles, no exceptions.
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