Signs & advertisements adjacent to certain highways; signs affixed to real property owned by WMATA.

Signs and advertisements adjacent to certain highways; signs affixed to real property owned by WMATA. Adds to the list of signs exempt from certain requirements for outdoor advertising in sight of public highways signs containing advertisements or notices that have been authorized by a county or a city and that are securely affixed to real property that is owned by the Washington Metropolitan Area Transit Authority, provided that such signs comply with any applicable federal requirements.