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Interstate H-201 (H-201) is the only auxiliary Interstate Highway located on the island of O‘ahu in the U.S. state of Hawaii. The H-201 designation is also known as the Moanalua Freeway. The loop route connects exits 13 and 19 on H-1, passing Fort Shafter, Tripler Army Medical Center, and Red Hill. Despite being designated an Interstate in 1989, until recently the route was a hidden Interstate signed only as Route 78. Interstate signs started appearing in mid-2004. The section of the Moanalua Freeway between Route 99 (Kamehameha Highway) and the western H-1 interchange remains designated as Route 78. Because this roadway was formerly an unsigned Interstate designation, it was commonly thought to be the only segment of freeway in Hawaii to not have an Interstate designation. ==History== The length of H-201 was originally designated as Route 78. The Federal Highway Administration approved the addition of H-201 to the Interstate Highway System on November 1, 1989. The Hawaii Department of Transportation (HDOT) asked 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 U.S. 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, the state Department of Transportation 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 (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 Interstate 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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Interstate H-201」の詳細全文を読む スポンサード リンク
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