Haw. Rev. Stat. § 264-73
The director of transportation may promulgate rules and regulations governing the erection and maintenance of outdoor advertising permitted under section 264-72, consistent with the safety and welfare of the traveling public and with the national standards promulgated by the Secretary of Transportation pursuant to Title 23, United States Code.
[L 1966, c 45, pt of §2; HRS §264-73]
Rulemaking, see chapter 91.