Haw. Rev. Stat. § 46-47

All moneys received by any county from any public utility corporation under the provisions of the franchise granted to the corporation shall be kept in the highway fund created by section 249-18 and expended on the construction, maintenance, improvement, and repair of public roads and highways of the county in which the same are received, including for the purposes of this section, the installation, maintenance, and repair of street lights and power, and other charges for street lighting purposes as well as the replacement of old street lights, and footpaths or sidewalks; provided that in the city and county of Honolulu the city council may provide for the maintenance of the traffic department, for other purposes and functions connected with the prevention of automobile accidents and preservation of safety upon the highways and streets in the city and county of Honolulu, and for the establishment and maintenance, under the direction of the police department, of one or more vehicle testing stations, from the moneys.