A more thorough explanation:

Federal Motor Carrier Safety Administration

The Federal Motor Carrier Safety Administration (FMCSA) is a unit within the U.S. Department of Transportation that regulates the operation of large trucks and buses. Its main goal is to ensure the safety of commercial motor vehicles and their drivers on the nation's highways.

• The FMCSA sets and enforces safety regulations for commercial motor vehicles, such as hours-of-service rules for drivers and requirements for vehicle maintenance and inspections.
• The FMCSA also conducts safety audits and investigations to ensure that carriers and drivers are complying with regulations.

These examples illustrate how the FMCSA works to promote safety in the commercial motor vehicle industry. By setting and enforcing regulations, conducting safety audits, and investigating non-compliance, the FMCSA helps to reduce the number of accidents and fatalities involving large trucks and buses on the nation's highways.