Definitions What is a process agent? What is an exempt for-hire (exempt commodities) motor carrier? What is a private motor carrier of passengers (business) and what is a private motor carrier of passengers (non-business)? What is a private motor carrier? What are the definitions of motor carrier, broker and freight forwarder authorities? What is the definition of an authorized for-hire carrier? What is the difference between interstate commerce and intrastate commerce? What is Operating Authority (MC number) and who needs it? What is freight interlining?