Which agency is responsible for the regulation of interstate trucking?

The Federal Motor Carrier Safety Administration (FMCSA) is the agency specifically tasked with overseeing and regulating interstate trucking. This includes setting safety standards for commercial motor vehicles, ensuring compliance with regulations, and promoting safe and efficient transportation across state lines. The FMCSA's primary focus is on commercial motor vehicle safety, which encompasses everything from driver qualifications to vehicle maintenance and operation standards.

While the Department of Transportation oversees all aspects of transportation in the United States, including highways, rail, aviation, and maritime, the FMCSA is the dedicated branch that directly handles issues related strictly to motor carriers involved in interstate commerce. This distinguishes its role as specialized and focused in the context of trucking regulation.

The Environmental Protection Agency is focused on environmental protection and does not regulate trucking practices directly. Similarly, the Occupational Safety and Health Administration deals with workplace health and safety across various industries, but it does not specifically regulate the operations of trucking companies or drivers in an interstate context. Thus, the FMCSA is the correct choice for regulating interstate trucking.