Section 642.002 does not apply to a commercial motor vehicle, road-tractor, or truck-tractor that is:
(1) registered under Section 502.433;
(2) required to be registered under Section 113.131, Natural Resources Code;
(3) operated in private carriage that is subject to Title 49, Code of Federal Regulations, Part 390.21;
(4) operated under the direct control, supervision, or authority of a public utility, as recognized by the legislature, that is otherwise visibly marked; or
(5) transporting timber products in their natural state from first point of production or harvest to first point of processing.