Two distinct enforcement impacts emanate from the "effective control" provisions:
- The removal of unlawful signs;
- The reasonable enforcement of land use control concepts that are applicable to nonconforming signs such as abandonment, destruction, and customary maintenance.
An unlawful sign is one which is erected and/or maintained in violation of the law. A sign is nonconforming if it was erected prior to the effective date of state law, but does not conform to the law's requirements. The term "grandfathered" sign is often used in relation to nonconforming signs.