(a) The exercise of the powers and duties of the Administration is subject to the authority of the Secretary and, where applicable, the Maryland Transportation Authority.

(b) By regulation or directive, the Secretary or, where applicable, the Maryland Transportation Authority may require that the exercise of any power or duty of the Administration be subject to the prior approval of the Secretary or the Maryland Transportation Authority, as the case may be.

(c) This section does not apply to the powers and duties vested in the State Roads Commission by Article III, § 40B of the Maryland Constitution.