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Colorado has adopted Part 393 of the Federal Regulations.
Part 393 applies to a self-propelled or towed vehicle bearing an apportioned plate or having a manufacturer’s gross vehicle weight rating or gross combination rating of at least 16,001 pounds. Part 393 also applies to a vehicle used on a public highway to transport a placardable amount of hazardous materials.
Vehicles with a manufacturer’s gross vehicle weight rating or gross combination rating of 10,001 pounds to 16,000 pounds must comply with the load securement requirements (Part 393, Subpart I) and coupling device requirements (Part 393, Subpart F).
No requirements.
No motor vehicle may be driven or moved on any street or highway unless it is equipped with splash guards. Splash guards are defined as mudflaps, aprons made of rubber, plastic, or fabric, or other devices directly behind the rear-most wheels, designed to minimize the spray of water and other substances to the rear.
Splash guards must be wide enough to cover the full tread of the tire or tires being protected, hang perpendicular from the vehicle not more than 10 inches above the surface of the street or highway when the vehicle is empty, and generally maintain their perpendicular relationship under normal driving conditions.
Exception — There are exceptions for certain types of vehicles, including trailers equipped with fenders and truck tractors or converter dollies when used in combination with other vehicles.
No tire may have any block, stud, flange, cleat, spike, or other protuberances of any material other than rubber that projects beyond the tread surface.
Tire chains of reasonable size may be used.
Signs along the roadway indicate when the chain law is in effect and when vehicles, including commercial motor vehicles, must be chained. A commercial motor vehicle is defined as having a gross vehicle weight rating or gross combination weight rating of 16,001 or more pounds.
Commercial motor vehicles that have four or more drive wheels must chain four wheels. Dual tire chains are acceptable.
From September 1 to May 31 commercial vehicles operating on I-70 between mileposts 133 and 259 must carry sufficient chains (as defined in 42-4-106(5)(a)(I) CRS), tire cables, or alternative traction devices (as identified in 2 CCR 601-14) at all times.
For more information: www.cotrip.org/truckers.htm