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CMV parts and maintenance - Colorado

RegSenseTiresFleet SafetyState InfoCMV Parts and MaintenanceColoradoParts and Accessories - Motor CarrierBest ResultsFocus AreaEnglishTransportation

Colorado has adopted Part 393 of the Federal Motor Carrier Safety Regulations (FMCSRs), as in effect on October 1, 2024.

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).

First Aid Kit No requirements
Mudflaps All motor vehicles must be 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.

Exceptions: 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.
Tires
Studded tires - 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 - 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 GVWR or GCWR ≥ 16,001 lbs.
Commercial motor vehicles must carry tire chains (or alternate traction devices approved by the Colorado Department of Transportation) on the following highways from September 1 to May 31 of each year:
  • I-70 west of milepost 259 (Morrison to Utah state border);
  • Colorado Highway 9, milepost 63 to milepost 97 (Frisco to Fairplay);
  • Route 40 west of milepost 256 (Empire);
  • US Route 50 west of milepost 225 (Salida);
  • US Route 160 west of milepost 304 (Walsenburg);
  • US Route 285 west of milepost 250 (Morrison); and
  • US Route 550 from milepost 0 to 130.

Additional information may be accessed via the Colorado State Patrol website: https://csp.colorado.gov/chain-law-information.
['CMV Parts and Maintenance']
['Parts and Accessories - Motor Carrier', 'Tires']
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