The intent of this article is to regulate the size, illumination, materials, location, height, and condition of all signs placed upon private property for exterior observation within the County to promote the creation of a convenient, attractive and harmonious community, ensure the safety of pedestrians and motorists, and preserve property values. This article is intended to allow adequate communication through signage while encouraging aesthetic quality in the design, location, size and purpose of all signs. This article shall be interpreted in a manner consistent with the First Amendment of the United States Constitution. If any provision of this article is found to be invalid, such finding shall not affect the validity of other provisions of the article that can be given effect without the invalid provision.