For traffic safety, signs located within the triangular area on a corner lot formed by measuring 30 feet along both street side property lines from their intersection or 10 feet from the intersection of a property line adjacent and parallel to a public street and a private street or driveway shall maintain a three-foot maximum top height. The City Engineer may approve a sign within the traffic visibility triangle if it can be demonstrated that it does not impact traffic safety. On a site-specific basis, as an alternative, the City Engineer may apply AASHTO standards based on a site-specific evaluation of intersection visibility.