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Texas has adopted Sec. 390.21 of the Federal Regulations for intrastate commerce.
The following intrastate vehicles are required to have and display a US DOT number and register with the Texas DMV for intrastate authority (Texas Motor Carrier Registration Certificate):
The following intrastate vehicles are not required to have and display a US DOT number or register with the Texas DMV for intrastate authority (Texas Motor Carrier Registration Certificate):
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.