Driver means any person who operates any commercial motor vehicle.
Interstate commerce means trade, traffic, or transportation in the United States—
(1) Between a place in a State and a place outside of such State (including a place outside of the United States);
(2) Between two places in a State through another State or a place outside of the United States; or
(3) Between two places in a State as part of trade, traffic, or transportation Intrastate commerce means any trade, traffic, or transportation in any State which is not described in the term ``interstate commerce.'' Motor vehicle means any vehicle, machine, tractor, trailer, or semitrailer propelled or drawn by mechanical power and used upon the highways in the transportation of passengers or property,
Operator -- See driver.
Primary source (GovInfo.gov):
Code of Federal Regulations, Title 49, Volume 4, Chapter III, § 382.107 — Definitions. (1998)
"Driver means any person who operates any commercial motor vehicle."