was designated for carpools of four or more people in October 1974. The highway was designated as Route 78 in the early 1970s. The Federal Highway Administration approved the addition of H-201 to the Interstate Highway System on November 1, 1989. HDOT requested that the Moanalua Freeway be reclassified as an Interstate so that the interchange with H-1 at the eastern end could conform to federal highway standards. HDOT originally asked the American Association of State Highway and Transportation Officials (AASHTO) in June 1990 to approve the freeway as H-1A in an application to AASHTO's Special Committee on US Route Numbering, the committee which approves Interstate Highway designations. HDOT resubmitted a request later that year to number it as H-101, and AASHTO approved it as H-201 on December 8, 1990. The highway was initially designated H-1A, but AASHTO policy does not generally allow alphabetic suffixes in Interstate numbers. The final designation, H-201, conforms to the general rule for three-digit Interstate loop routes that uses an even initial digit. Until 2004, HDOT chose not to sign H-201 as such, instead retaining the designation Route 78. Reasons given included the following: inability to render the new route number in a legible manner (because it has four characters, longer than the one to three characters of any other Interstate, it is necessary to use the thinnest font to render the number, and the shield is wider than the standard Interstate shield) encouraging motorists to use the newer and better designed H-1 avoiding confusion with H-2 In July 2004, in conjunction with a major resurfacing of both sides of the freeway, it was decided to bring the signage in line with the official designation. Exit list See also References External links Photos of Interstate H-201 at Hawaii Highways Exit list for Interstate H-201 at Hawaii Highways H201 Interstate Highways in Hawaii Transportation in Honolulu County, Hawaii Transportation in Honolulu