Maryland Code, Transportation § 8-735

(1) That lawfully existed along or near any federal-aid primary highway on July 1, 1975;

(2) That was lawfully erected and, after July 1, 1975, became nonconforming; or

(3) That lawfully existed along or near any highway that was made a part of the federal-aid primary system on or after October 22, 1965.

(b)(1) The Administration may pay compensation under this section only for:

(2) The Administration may not spend funds to control outdoor signs under the federal Highway Beautification Act of 1965  1 and the Federal-Aid Highway Amendment of 1974,  2 until appropriate matching federal funds are available to this State under these acts.