This section does not apply to capital expenditures by the Department of Transportation or the Maryland Transportation Authority, in connection with State roads, bridges, or highways, as provided in § 12-202 of this title. Notwithstanding any delegation of authority under § 12-101 of this subtitle, the Board retains full authority to engage in procurement of services and supplies for itself. By resolution, the Board may authorize a Board member or a unit to exercise all or any part of the authority of the Board for a specific Board procurement or for a particular class of Board procurements.