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Vehicles weighing more than 26,000 pounds are required to carry snow chains while driving on Interstate 70 between Dotsero, Colo., and Morrison, Colo., according to the Colorado Department of Transportation.

The chain law requirementÌýbegan Saturday and allows drivers to use the AutoSock, a fabric cover that slips over tires to improve traction, rather tchains.

CDOT has 21 lighted chain stations along I-70 to safeguard drivers chaining up.