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Any self-propelled or towed motor vehicle used on a highway in interstate commerce to transport passengers or property when the vehicle:
To obtain your U.S. DOT number instantly, file online. You can also request an application (MCS-150 and MCS-150a) by calling the Federal Motor Carrier Safety Administration (FMCSA) at 800-832-5660, or by calling the FMCSA office in your respective state: