Which of the following is NOT typically used to classify signs?

The classification of signs into various categories is essential for understanding their purpose, usage, and regulatory standards. The distinction between types of signs is generally based on functional attributes rather than the environments they serve.

When it comes to sign classification, types such as permanent versus temporary, lighted versus unlighted, and ground versus wall all focus on the physical and operational characteristics of the signs themselves. These criteria are widely used in building and zoning regulations to determine placement, permit requirements, and compliance with local ordinances.

In contrast, classifying signs as commercial versus residential centers around the context or location of the sign rather than its inherent properties. This classification does not provide a clear functional characteristic of the sign itself but rather indicates the zone in which the sign operates. This is less typical in the regulatory context where classifications that describe the sign's functionality are favored. Thus, focusing solely on commercial versus residential does not align with the standard system of sign classification generally used in code enforcement.