With snow starting to fall in Colorado, law enforcement officers are ensuring that commercial motor vehicles are complying with the state’s commercial vehicle chain law.

The Colorado State Patrol and Colorado Port of Entry Officers conducted their second chain law enforcement operation of the season on Wednesday on Interstate 70 near Dotsero, according to a news release.

Colorado’s commercial vehicle chain law and passenger vehicle traction laws went into effect Sept. 1, requiring commercial vehicles to carry chains and passenger vehicles to have proper traction devices. The winter driving laws remain in effect through the end of next May.

The enforcement operation contacted 468 commercial vehicles and resulted in a total of 50 violations for failing to carry chains, the release states. That’s about 90% compliance with the chain law among the vehicles stopped.

Under state law, a violation of the commercial vehicle chain law can result in a fine of up to $500, increasing to up to $1,000 if the vehicle is stuck and blocking traffic.

One of the commercial vehicles stopped on Wednesday was taken off the road due to the driver not having a commercial driver’s license, according to the State Patrol.