パンアメリカンハイウェイ
The Pan-American Highway route in North America is the portion of a network of roads nearly 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 United States, the Federal Highway Administration (FHWA) 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. Mexico officially has many branches connecting to various interstate highways at the U.S. border.