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View the regulations for Part 390
Guidance for § 390.21: Marking of self-propelled CMVs and intermodal equipment.
Question 1: What markings must be displayed on a CMV when used by two or more motor carriers?
Guidance: The markings of the motor carrier responsible for the operation of the CMV must be displayed at the time of transportation. If 2 or more names are on the vehicle, the name of the operating motor carrier must be preceded by the words "operated by."