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The Pan-American Highway route in North America is the portion of a network of roads nearly 48,000 km in length which travels through the mainland nations of the Americas. No definitive length of the Pan American Highway exists because the Canadian government has never officially defined any specific route as being part of the Pan-American Highway, while in the U.S., the Federal Highway Administration(FHA) has designated the entire Interstate Highway System part of the Pan-American Highway System, although this has not yet been reinforced by any official highway signage.〔American Automobile Association, American Motorist, (ca. 1974 )〕〔New Mexico State Highway and Transportation Department, (State of New Mexico Memorial Designations and Dedications of Highways, Structures and Buildings ), 2007, p. 14〕 Mexico officially has many branches connecting to various interstate highways at the U.S. border. However, the total length of the North American portion of the highway following the most direct route is roughly . Partial lengths (with references): *Length: (from Circle to Fairbanks - ''unofficial'') *Length: (from Fairbanks, Alaska to Whitehorse, Yukon - ''unofficial'')〔() 〕 *Length: (from: Whitehorse, Yukon to Prince George, BC - ''unofficial'')〔 *Length: 778 km (from Prince George to Vancouver, BC)〔http://www.th.gov.bc.ca/popular-topics/distances/calculator.htm〕 (''undefined'') *Length: 276.62 miles (total length of I-5 in Washington) (''official per FHA'') *Length: 308.14 miles (total length of I-5 in Oregon) (''official per FHA'') *Length: 796.53 miles (total length of I-5 in California) (''official per FHA'') == United States (Alaska) == Alaska * Prudhoe Bay, Alaska The Pan-American Highway unofficially begins in Prudhoe Bay, Alaska near Deadhorse. Traveling south to Fairbanks, Alaska follows the length of the Dalton Highway (Alaska Route 11) and Alaska Route 2. * Fairbanks From Alaska's third largest city, the Pan-American Highway and the Alaska Highway are one and the same, following Alaska Route 2 southeast to the Canadian border southeast of Northway, Alaska, and adjacent to the Tetlin National Wildlife Refuge. ''Note: The Pan-American Highway reenters the U.S., potentially in several locations along the U.S.-Canadian border.'' 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「Pan-American Highway (North America)」の詳細全文を読む スポンサード リンク
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