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Traction Law (Code 15)
During an active Traction Law (also known as a Code 15), motorists must have either snow tires, tires with the mud/snow (M+S) designation, or a four-wheel/all-wheel drive vehicle. All tires must have a minimum one-eighth inch tread.
Under a Traction Law, both metal-studded and studless snow tires comply with the "snow tire" requirement of the law. CDOT recommends using studless snow tires instead of studded because studded tires can chip and cut grooves in the road, creating a hydroplaning hazard when the roadway is wet. Whether using studded or studless snow tires, all the tires must have a minimum one-eighth inch tread.
Então, se fosse apenas o alerta da Lei de Tração (não o Alerta da Lei de Cadeia), então um AWD estaria bem, mesmo com pneus que não sejam de inverno. Mas havia também um Alerta da Lei de Cadeia que exige que TODOS os veículos tenham correntes instaladas:
Under an active Passenger Vehicle Chain Law, every passenger vehicle will need to have chains or an alternative traction device equipped.