(a) General rule.--The director is authorized and directed to enforce the provisions of this subchapter and to adopt, with the approval of the department, such rules and regulations as are deemed necessary to carry out the provisions of this subchapter.

(b) Nonapplication.--The provisions of this chapter shall not be applicable to the weighing of vehicles when conducting an investigation for compliance with the provisions of 75 Pa.C.S. Ch. 49 (relating to size, weight and load). The provisions of this chapter shall not apply to a qualified Commonwealth employee, as defined in 75 Pa.C.S. § 4102 (relating to definitions), engaged in the inspection, weighing or measuring of vehicles as required by 75 Pa.C.S. § 4704 (relating to inspection by police or Commonwealth personnel), 4981 (relating to weighing and measurement of vehicles) or 8302 (relating to powers and duties of department).