Md. Code Ann., Transp. § 8-728
(2) The sign is:
A person may not use his property or allow his property to be used by any other person for the erection or maintenance of any outdoor sign along or near any federal-aid primary highway, unless:
Added by Acts 1977, c. 13, § 2, eff. July 1, 1977.
Formerly Art. 89B, § 252.