(1) With the exception of and excluding those highways, or portions of highways, which are designated by the State Highway Commission as scenic byways, nothing contained in this chapter shall prohibit the erection and maintenance of outdoor advertising signs, displays, and devices consistent with customary use within six hundred sixty feet (660') of the nearest edge of the right-of-way of interstate, primary, and other state highways designated by the commission: Within those areas which are zoned industrial or commercial under authority of the laws of this state; or
(2) Within those unzoned commercial or industrial areas which may be determined by agreement between the commission and the United States Secretary of Transportation.
(3) Neither shall these prohibitions apply to signs, displays, and devices: Advertising the sale or lease of property upon which they are located;
(4) Advertising activities conducted on the property upon which they are located;
(5) Which locate, identify, mark, or warn of the presence of pipelines, utility lines, or rail lines, and appurtenances thereto, including, but not limited to, markers used in maintenance, operation, observation, and safety; and
(6) Granted an exemption by the United States Secretary of Transportation pursuant to 23 U.S.C. § 131(o).
(7) The erection of outdoor advertising signs, displays, and devices along a scenic byway shall be limited to those permitted by 23 U.S.C. § 131(c).