Title 46, Chapter 7, Section 36
In circumstances where a motor common or contract carrier is engaged in both interstate and intrastate commerce, it shall nevertheless be subject to all the provisions of this article so far as it separately relates to commerce carried on exclusively in this state. It is not intended that the commissioner shall have the power of regulating the interstate commerce of such motor carrier, except to the extent expressly authorized by this article as to such commerce. Code Sections 46-7-14 and 46-7-18 through 46-7-20 and 46-7-23 do not apply to purely interstate commerce nor to carriers exclusively engaged in interstate commerce. When a motor common or contract carrier is engaged in both intrastate and interstate commerce, it shall be subject to all the provisions of this article so far as they separately relate to commerce carried on in this state.