Viewing cone definition

Viewing cone means the triangular area described as the point directly below the face of the billboard closest to the highway, the point directly below the billboard face farthest away from the highway, a point as measured from a point directly adjacent to the part of the billboard closest to the closest edge of the highway and extending back parallel to the highway the distance that provides the view of the billboard prescribed in this section, and the triangle described by the points extending upward to the top of the billboard.