No sign may be erected or maintained that:
(a) Imitates or resembles an official traffic sign, signal or device;(b) Is erected, painted or drawn upon trees, rocks or other natural features;(c) Is structurally unsafe or in disrepair; or(d) Is erected adjacent to a scenic byway that is a primary or Interstate highway after the effective date of this amendatory Act of 1996, except those signs described in Sections 4.01, 4.02, 4.03, 4.06, and 4.08 of this Act.P.A. 89-605, eff. 8/2/1996.