Harold Hitz Burton,
Levinson v. Spector Motor Service…
“ We recognize the Interstate Commerce Commission as the agency charged with the administration and enforcement of the Motor Carrier Act and especially charged with the establishment of qualifications and maximum hours of service of employees of common and contract carriers and private carriers of property by motor vehicle in interstate and foreign commerce. We see no reason to question its considered conclusion that the activities of full-duty drivers, mechanics, loaders and helpers, as defined by it, affect safety of operation of the carriers by whom they are employed. ”
