Haw. Code R. § 19-12-14
In any case in which these rules may be finally held to interfere with the use or enjoyment of land to such an extent as to be in violation of the state constitution or the Constitution of the United States, such holding shall not affect the application of these rules to other structures, trees, or parcels of land.
These rules are hereby declared to be severable and if any portion or the application thereof to any person, circumstance, or property is held to be invalid for any reason, the validity of that portion or its application to any other person, circumstance, or property, and the validity of the remainder of these rules, or the application of the remainder to any person, circumstance, or property shall not be affected.
Haw. Code R. § 19-12-14