Nothing in this title, either by inclusion or omission, shall be deemed to be in conflict with Public Law 89-285, 89th Congress, S. 2084, October 22, 1965, known as the Highway Beautification Act of 1965, 79 Stat. 1028, or the State Scenic Highway Act of 1963, as such laws apply or may apply to the portions of the interstate system and the primary system of the federal and state highways now within or which may come within the limits of the city. (Ord. 89-3 (part), 1989)