Section 392.9b - Prohibited transportation(a)Safety registration required. A commercial motor vehicle providing transportation in interstate commerce must not be operated without a safety registration and an active USDOT Number.(b)Penalties. If it is determined that the motor carrier responsible for the operation of such a vehicle is operating in violation of paragraph (a) of this section, it may be subject to penalties in accordance with 49 U.S.C. 521 .78 FR 52655, 8/23/2013; 78 FR 52644, 1/14/2017; as amended at 81 FR 68358, 10/4/2016