Maryland Code, Transportation § 8-621

(1) Regulate, restrict, or prohibit any specific access to the parkway or freeway from any other highway, if reasonable access to the parkway or freeway from the other highway otherwise is provided;

(2) Regulate, restrict, or prohibit the use of the parkway or freeway by any class of vehicles or traffic, if an alternate route is provided for the restricted or prohibited classes; and

(3) Maintain, discontinue, abandon, close, and exercise any other powers over the parkway or freeway to the same extent and in the same manner as in the case of any other highway.