Sec. 9. (a) A sign lawfully erected in an adjacent area that does not conform to this chapter after June 30, 1968, is not required to be removed until the end of the fifth year after the sign becomes nonconforming.
(b) A sign located beyond six hundred sixty (660) feet of the right-of-way, visible from the traveled way of a highway on the interstate or primary system, that was lawfully erected before July 1, 1976, and does not conform to this chapter is not required to be removed until the end of the fifth year after the sign becomes nonconforming.