Haw. Rev. Stat. § 264-72: Control of outdoor advertising.

No person shall erect or maintain any outdoor advertising outside of the right-of-way boundary and visible from the main-traveled way of any federal-aid or state highway within the State, except the following:

(1) Directional and other official signs and notices, which signs and notices shall include, but not be limited to, signs and notices pertaining to natural wonders, scenic and historic attractions as authorized or required by law.

(2) Signs, displays, and devices advertising the sale or lease of the property upon which they are located.

(3) Signs, displays, and devices advertising activities conducted on the property upon which they are located.

(4) Signs lawfully in existence on October22, 1965, determined by the director to be landmark signs, including signs on farm structures or natural surfaces, of historic or artistic significance the preservation of which would be consistent with the purpose of this section.