Sec. 4. (a) Transport operator license plates may only be used for the purpose of transporting:
(1) vehicles in transit; or
(2) sectionalized buildings.
(b) A person may haul:
(1) other vehicles; or
(2) parts of vehicles;
in transit in the same combination.
(c) A transport operator may not operate a vehicle or any combination of vehicles in excess of the size and weight limits specified by law.
(d) A license plate or sign other than those furnished and approved by the secretary may not be used.