49 CFR 391.13: Responsibilities of drivers.

In order to comply with the requirements of §§ 392.9(a) and 383.111(a)(16) of this subchapter, a motor carrier shall not require or permit a person to drive a commercial motor vehicle unless the person—

(a) Can, by reason of experience, training, or both, determine whether the cargo he/she transports (including baggage in a passenger-carrying commercial motor vehicle) has been properly located, distributed, and secured in or on the commercial motor vehicle he/she drives;

(b) Is familiar with methods and procedures for securing cargo in or on the commercial motor vehicle he/she drives.