(a) The following signs are permitted to be erected and maintained in the controlled area:

1. (1) official signs;
2. (2) directional signs, in accordance with section 150.14 of this Part; and

3. (3) on-premises signs, in accordance with section 150.13 of this Part.

   (b) Interstate system.

   In addition to paragraphs (a)(1), (2) and (3) of this section, the following signs are permitted in the following commercial or industrial zones within 660 feet of the interstate system:

4. (1) all commercial and industrial zones within the boundaries of incorporated municipalities, as those boundaries existed on September 21, 1959; and all other commercial and industrial zones established as of September 21, 1959 outside of such municipalities; and

5. (2) all zoned and unzoned commercial and industrial zones adjacent to portions of the interstate system constructed upon right-of-way, any part of which was acquired on or before July 1, 1956. (A portion shall be deemed so constructed if, within such portion, no line normal or perpendicular to the centerline of the highway and extending to both edges of the right-of-way will intersect any right-of-way acquired for right-of-way on or before July 1, 1956.)

   (c) Primary system.

6. (1) In addition to paragraphs (a)(1), (2) and (3) of this section, the following signs are permitted to be erected and maintained in the controlled area within 660 feet of the primary system:

   1. (i) signs in commercial or industrial zones; and
   2. (ii) signs in unzoned commercial and industrial areas.
7. (2) All signs erected after June 1, 1968 in the controlled area and within 660 feet of the nearest edge of the right-of-way shall comply with the criteria of sections 150.6, 150.7 and 150.8 of this Part.