Maryland Code, Transportation § 8-619

(a)(1) By written order, the Administration may lay out, establish, and construct any State highway as a parkway or a freeway.

(2) If a written order of the Administration states that a proposed highway is to be constructed as a parkway or a freeway, the order is conclusive evidence that, when the highway is constructed, it is a parkway or a freeway, as the case may be, with all the characteristics and incidents specified in this subtitle.

(c)(1) If a highway is constructed as a parkway or a freeway, no person, including an owner of property abutting the highway, has the right of access to or from the abutting land to or from the highway.

(2) At the time of construction, in the case of a parkway, or at any time, in the case of a freeway, the Administration, in its discretion, may designate points at which access to a parkway or freeway will be permitted and may specify from time to time terms and conditions of that access.