These devices can be deployed by the driver when the need for extra traction is required. ATD's are devices mounted under the vehicle that sling chain segments under the inside drive wheels. What are Automatic Traction Devices (A.T.D.'s) and are they legal in California?Īutomatic Traction Devices (A.T.D.'s) are used primarily on commercial vehicles, emergency vehicles, and busses. Tire traction devices are defined in the California Vehicle Code (VC) Section 605 as “devices or mechanisms having a composition and design capable of improving vehicle traction, braking, and cornering ability upon snow or ice-covered surfaces,” and include conventional link-type tire chains and cable chains, as well as other less conventional devices such as “Spikes Spyder.” When the term “chains” is used here, it means any “tire traction device” unless it specifically states link-type chain.
The exceptions will be posted on the sign. Depending on the severity of road conditions, some vehicles (passenger cars, 4-wheel drive vehicles with snow tires) may not be required to install chains at that point. When the road is posted with a sign requiring chains, all heavy-duty vehicles (over 6,500 pounds gross weight) must be equipped with chains mounted on the tires in order to proceed. Road Conditions - current road conditions, including chain requirementsįrequently Asked Questions What are the dates for the chain law?Ĭalifornia does not have any specific dates when vehicles are required to carry chains.Chain Controls - types of chain controls and snow-tread tire information.Chain Requirements (PDF) - diagrammed instructions for applying chains to your vehicle.
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