Hawaii Revised Statutes Division 1. Government § 264-20

(a) If a highway, including any bridge, principal and minor arterial road, collector and local road, or street, requires new construction, reconstruction, preservation, resurfacing (except for maintenance surfacing), restoration, or rehabilitation, the department of transportation with regard to a state highway, or a county with regard to a county highway, may select or apply flexible highway design guidelines consistent with practices used by the Federal Highway Administration and the American Association of State Highway and Transportation Officials. Flexibility in highway design shall consider, among other factors:

(b) Any other law to the contrary notwithstanding, any decision by the State, the department of transportation, a county, or any officers, employees, or agents of the State, the department of transportation, or a county to select or apply flexibility in highway design pursuant to this section and consistent with the practices used by the Federal Highway Administration and the American Association of State Highway and Transportation Officials shall not give rise to a cause of action or claim against:

(c) The exception to liability provided in subsection (b) applies only to the decision to select or apply flexibility in highway design pursuant to this section and does not extend to design, construction, repair, correction, or maintenance inconsistent with subsection (a).