The provisions of this subchapter apply 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 from the controlled highway. They also apply to those signs, displays and devices which are located in controlled areas beyond six hundred sixty (660) feet from the nearest edge of the right-of-way, if the sign display or device is visible from the controlled highway and has the purpose of being read from the highway.
Okla. Admin. Code § 730:35-5-2