The provisions of this act apply only to the erection and maintenance of outdoor advertising signs, displays and devices located in adjacent areas within six hundred sixty (660) feet from the nearest edge of the right-of-way and which are visible and intended to be read from the main traveled way and those which are located in controlled areas beyond six hundred sixty (660) feet from the nearest edge of the right-of-way, visible and intended to be read from the main traveled way and erected with the purpose of being read from the main traveled way.
Okla. Stat. tit. 69, § 1272