Which agency regulates large commercial trucks?

Commercial trucking is regulated by the Federal Motor Carrier Safety Administration (FMCSA), which was established in 2000 pursuant to the federal Motor Carrier Safety Improvement Act of 1999. FMCSA issues regulations concerning all safety aspects of commercial trucking, with the goal of preventing commercial motor vehicle-related fatalities and injuries. These regulations apply to driver qualifications, equipment inspection repair and maintenance, records, safety fitness procedures, leasing and interchange of vehicles, and numerous other aspects of the industry.