The Commissioner may cancel a registration certificate issued to a transporter, whenever, after hearing before the Commissioner or upon conviction in any court in this State, the Commissioner finds that the transporter has violated any motor vehicle law in this State or any lawful regulation of the Commissioner applying to transporters. A transporter whose certificate has been cancelled shall forthwith return to the Commissioner the registration certificate and the number plates furnished him or her by the Commissioner. (Added 1965, No. 106, § 5, eff. Feb. 1, 1966.)