Billboards with a maximum sign face area of up to seven hundred (700) square feet and a maximum length of sixty (60) feet may be permitted in any C-2, C-3, I-1, or I-2 Zoning District when the sign is adjacent to, and within three hundred (300) feet of, Highways 33 and 6 or arterial streets in the authorized district, provided that a special use permit therefor is granted and all other applicable restrictions of this Section and this Chapter, including spacing, are met.