Only the following signs shall be allowed within controlled portions of the interstate highway system and the federal-aid primary highway system as set forth in s. 479.11(1) and (2):
(1) Directional or other official signs and notices which conform to 23 C.F.R. ss. 750.151-750.155.
(2) Signs in commercial-zoned and industrial-zoned areas or commercial-unzoned and industrial-unzoned areas and within 660 feet of the nearest edge of the right-of-way, subject to the requirements set forth in the agreement between the state and the United States Department of Transportation.
(3) Signs for which permits are not required under s. 479.16.