The Federal Motor Carrier Safety Administration (FMCSA) creates and enforces commercial vehicle regulations in the U.S. Commercial vehicles include those that transport cargo or people for compensation. The most common is the semi-truck, also called a tractor-trailer or 18-wheeler.
FMCSA regulations include but are not limited to:
Insurance requirements
Hazardous material handling
Vehicle size and weight limits
Vehicle inspection and maintenance requirements
Licensing requirements
Hours of service limits
Drug testing and blood alcohol concentration limits
In the 2020 fiscal year, the FMCSA issued 22,686 warning letters. After thousands of investigations, it cited 8,668 acute/critical violations.