(1) The posting or maintaining of any notice required by law to be posted or maintained; or
(2) The placing and maintaining, within the limits of the right of way of any county road, of:
(a) Signs approved by the county governing body and giving information about scenic, historical, resort or recreational areas;
(b) Signs approved by the county governing body and giving information about community or civic enterprises of a noncommercial nature, or the proximity of tourist facilities, directions or distances for the information of the traveling public;
(c) Facility location signs of a public utility or telecommunications utility, when such signs are approved by the county governing body;
(d) Benches utilized as outdoor advertising signs, if approved by the county governing body; or
(e) Outdoor advertising signs on bus shelters erected or maintained for use by and convenience of customers of a mass transit district, a transportation district or any other public transportation agency, when such signs are approved by the county governing body. [1973 c.462 §4; 1987 c.403 §1; 1987 c.447 §143]