Section 306D.4. Scenic highway advertising.
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1. The department of transportation shall have the authority to adopt rules to control the erection of new advertising devices on a highway designated as a scenic highway or scenic byway in order to comply with federal requirements concerning the implementation of a scenic byways program.
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:
a. The location conforms to the requirements of chapters 306B and 306C.
b. The materials, number and type of supports, lighting, face size, and height of the advertising device remain the same.