The purpose of this article is to provide standards for structural stability and design of walls along arterial streets and state highways. All other design options, such as front-on lots with circular driveways, frontage roadways, or side-on lots, shall be considered first in protecting residential areas from adverse environmental impacts and walls shall be required only as a last design option. (Ord. 2013-0020 § 1; Ord. 2013-0007 § 1)