Haw. Code R. § 19-170-190
Traffic signs and markings for controlling, safeguarding, or expediting vehicular and pedestrian traffic shall be installed by the subdivider in each subdivision, coincident with construction of street improvements and utilities, before the roadways are open to public traffic, and before the first residential unit is occupied, and before a business enterprise or public or quasi-public agency commences operations, and shall be a part of the contract for subdivision improvements. Plans and specifications showing type, location, and installation of traffic signs and markings shall be submitted for approval to the executive officer and shall conform to the standard specifications on file in the department of transportation services. The subdivider shall bear full responsibility for regulating traffic and the total cost of maintaining and regulating traffic signs and markings in a satisfactory condition until such time as the streets are accepted by the City, the State or the development corporation, or the development corporation acquires jurisdiction to regulate private streets within the subdivision. The subdivider may install other traffic control devices where it is determined by the executive officer that the devices are necessary for providing adequate access to a subdivision.
Haw. Code R. § 19-170-190