Iowa Code § 306D.4
2. Notwithstanding subsection 1, if an advertising device was lawfully erected along an interstate highway within the corporate limits of a city prior to designation of the highway as a scenic byway and, after such designation occurs, the advertising device is displaced due to the reconstruction, improvement, or relocation of the highway, the advertising device may be relocated to a location determined by the department to be substantially the same location, subject to approval by the federal highway administration, and shall not be considered an erection of a new advertising device, if all of the following apply:
95 Acts, ch 135, §4; 2013 Acts, ch 140, §22
Referred to in §306C.11