Most states worry about rain and the occasional ice storm. Trucking companies in Colorado deal with something a lot more specific: a mandatory chain law that applies to commercial vehicles for nine months out of every year in the USA's only state with a rule quite like it, regardless of whether it's actually snowing when you cross into the mountain corridor. The chain law that catches out-of-state drivers off guard Since August 7, 2024, under Colorado's Senate Bill 24-100, every commercial motor vehicle with a gross vehicle weight rating over 16,001 pounds must physically carry chains or an approved alternative traction device while operating on designated Colorado Mountain Corridors — not just when conditions look bad, but as a standing requirement from September 1 through May 31 every year. That's the "Must Carry" law, and it covers multiple designated mountain corridors, not just the classic I-70 stretch most people picture. Carrying the equipment is ...
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