The notion that there could and should be an inter-American highway, linking the nations of North, Central, and South America, is an idea originating from the United States. There it splits into several spurs leading to the Mexico–United States border. West and north of the Darién Gap, this roadway is also known as the Inter-American Highway through Central America and Mexico. Several southern highway termini are claimed, including the cities of Puerto Montt and Quellón in Chile, and Ushuaia in Argentina. The Pan-American Highway system is physically mostly complete and extends in de facto terms from Prudhoe Bay, Alaska, in North America, to the southernmost reaches of South America. Some areas are fully passable only during the dry season. The Pan-American Highway passes through many diverse climates and ecological types-ranging from dense jungles to arid deserts and barren tundra. It is only possible to cross by land between South America and Central America-the last town in Colombia to the first outpost in Panama-by a difficult and dangerous hike of at least four days through the Darién Gap, one of the rainiest areas of the planet.
According to Guinness World Records, the Pan-American Highway is the world's longest "motorable road". Except for a break of approximately 106 km (66 mi) across the border between northwest Colombia and southeast Panama called the Darién Gap, the roads link almost all of the Pacific coastal countries of the Americas in a connected highway system. The Pan-American Highway ( French: (Auto)route panaméricaine/transaméricaine Portuguese: Rodovia/Autoestrada Pan-americana Spanish: Autopista/Carretera/Ruta Panamericana) is a network of roads stretching across the Americas and measuring about 30,000 kilometres (19,000 mi) in total length. Interstate Highway System brought official status to most previously unofficial routes in the lower 48 states. A few selected unofficial routes shown through the United States and Canada as they existed in the early 1960s. The Pan-American Highway from Prudhoe Bay, Alaska, to Quellón, Chile, and Ushuaia, Argentina, with official and unofficial routes shown in Mexico and Central and South America.
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