Amends GS 136-129 to exempt specified outdoor advertising promoting a bona fide farm from the prohibition on outdoor advertising within 660 feet of the right-of-way of the interstate or primary highway system.  In order to be exempt, the outdoor advertising must promote a bona fide farm that is exempt from specified zoning regulations if the sign is more than three feet long on any side and it is located on the bona fide farm property (this replaces the exemption that applied to advertisements for the sale of any fruit or vegetable crop by the grower at a roadside stand or by having the purchaser pick the crop on the property if the sign met specified requirements).