Signs obstruct views, distract motorists, displace alternative uses for land, and pose other problems that legitimately call for regulation. The purpose of Section
415.400, et seq., of this Code, as amended, is to regulate the size, color, illumination, movement, materials, location, height and conditions of all signs placed on private property for exterior observation, thus ensuring the protection of property values, the character of the various neighborhoods, the creation of convenient, attractive and harmonious community, protection against destruction of or encroachment on historic convenience to citizens and encouraging economic development. Sections
415.400, et seq., of this Code allows adequate communication through signage while encouraging aesthetic quality in the design, location, size and purpose of all signs. Section
415.400, et seq., must be interpreted in a manner consistent with the First Amendment guarantee of free speech.