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The following carriers must display their name and US DOT number on the power unit of each vehicle:
Vehicle identification information must be displayed in letters that contrast sharply with the vehicle's background color and must be readily legible from 50 feet during daylight hours while the vehicle is stationary. If the name of a person other than the operating carrier appears on the vehicle, the words “operated by” must precede the name of the operating carrier.
The following intrastate vehicles are not required to have a US DOT number for registration, or display their name and US DOT number on the vehicle:
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.