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Missouri has adopted Sec. 390.21 of the Federal Regulations.
All commercial vehicles operating solely in intrastate transportation must display their USDOT number followed by “MO” on all vehicles.
Example: US DOT 123456 MO
Section 390.21 applies to an intrastate vehicle with a gross vehicle weight rating or gross combination weight rating, or gross vehicle weight or gross combination weight of 26,001 pounds or more, or a vehicle of any size transporting a placardable amount of hazardous materials.
All commercial motor carriers (for-hire and private) operating interstate are subject to the marking requirements of 49 CFR 390.21 which requires all CMVs to display, on both sides of the power unit, the US DOT number and the legal name of the business entity that owns or controls the motor carrier operation, or the “doing business as” (DBA) name, as it appears on the Form MCS-150.
Any new or used commercial vehicles added to a motor carrier’s fleet must be identified with the US DOT number and single trade name before being put into service.
The regulations do not require the MC number or city/state to be displayed on the vehicle.