HCC §23-50
Street slope and curve rules for new roads
Read the official text at hawaiicounty.gov ↗This section sets minimum and maximum slopes for different types of streets, and requires curves to allow drivers to see far enough ahead. The public works director can allow exceptions for unusual conditions and may add extra standards.
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The ordinance, as written (Hawaiʻi County) — Grades and curves
A copy, taken August 21, 2026. The version published by Hawaiʻi County is the one that governs, and it may have changed since. Check it before relying on anything here.
(a) A grade of a street shall be a reasonable minimum but in no case be less than one- half of one percent and shall not exceed seven percent on major arterials, eight percent on secondary arterials, ten percent on collector streets, or twelve percent on any other street. No grade shall be less than one-half of one percent at the gutter. Vertical and horizontal curves shall be so designed as to give nonpassing distance visibility in conformance with the following minimum requirements: Vertical Horizontal Classification Curve Curve Primary arterial 500 feet 500 feet Secondary arterial 500 feet 500 feet Business or industrial street 500 feet 500 feet Collector street 300 feet 300 feet Minor street 300 feet 300 feet Cul-de-sac 100 feet 200 feet (b) Variations from the required grades or curves may be permitted by the director and the director of public works where advisable to meet unusual conditions and the director of public works may specify additional standards accordingly.
Published by the County of Hawaiʻi Office of the County Clerk.
LawTrove is not legal advice. The summary above is a computer-generated restatement — the authoritative text is the official version linked above.