Hawaii Revised Statutes Division 1. Government § 291C-107

(1) An engineering study conducted for the road whose maximum speed limit is being set; provided that the engineering study shall include an analysis of the current speed distribution of free-flowing vehicles; provided further that the requirements of this paragraph shall not apply when the department of transportation or any county reduces a maximum speed limit within one mile of a school; and

(2) Any other factors prescribed by the Federal Highway Administration's Manual on Uniform Traffic Control Devices, as amended.

(1) Roadway characteristics including but not limited to shoulder condition grade, alignment, sight distance, and lane widths;

(2) Roadside development and environment, including the following:

(3) Motor vehicle crashes resulting in deaths or injuries; and

(4) Prevailing speeds as determined by traffic engineering measurements.