A commercial motor vehicle is any vehicle used in commerce to transport passengers or property with either:
The CSA is a Federal Motor Carrier Safety Administration (FMCSA) initiative to improve large truck and bus safety and ultimately reduce crashes, injuries, and fatalities that are related to commercial motor vehicle
The FMCSA was established within the Department of Transportation on January 1, 2000. Their primary mission is to prevent commercial motor vehicle-related fatalities and injuries.
What Does The FMCSA Do?
A department of the federal executive branch responsible for the national highways and for railroad and airline safety. It also manages Amtrak, the national railroad system, and the Coast Guard.
State and Federal DOT Officers are responsible for commercial vehicle enforcement. "The truck police" you could call them.