49 C.F.R. § 381.110
Commercial motor vehicle means any motor vehicle that meets the definition of "commercial motor vehicle" found at 49 CFR 382.107 concerning controlled substances and alcohol use and testing, 49 CFR 383.5 concerning commercial driver's license standards, or 49 CFR 390.5 concerning parts 390 through 399 of the FMCSRs.
Federal Motor Carrier Safety Administrator (the Administrator) means the chief executive of the Federal Motor Carrier Safety Administration, an agency within the Department of Transportation.
FMCSRs means Federal Motor Carrier Safety Regulations (49 CFR parts 380, 382, 383, and 384; 49 CFR 390.19 and 390.21 ; and 49 CFR parts 391 through 393, 395, 396, and 399).
You means an individual or motor carrier or other entity that is, or will be, responsible for the operation of a CMV(s). The term includes a motor carrier's agents, officers and representatives as well as employees responsible for hiring, supervising, training, assigning, or dispatching of drivers and employees concerned with the installation, inspection, and maintenance of motor vehicle equipment and/or accessories. You also includes any interested party who would like to suggest or recommend that the FMCSA initiate a pilot program.
49 C.F.R. §381.110