National Route 7 (full name in Spanish: Ruta Nacional 7 Carretera Libertador General San MartÃn) is a road in Argentina. It crosses the country from east to west, from the capital (Buenos Aires) to the border with Chile, thus linking the Atlantic coast with the Andes, crossing the provinces of Buenos Aires, Santa Fe, Córdoba, San Luis and Mendoza. National Route 7 is a branch of the Pan-American Highway, and continues into Chile under the name of Route CH-60. The origins of this route go back to the Western Camino Real, which was used since the colonial era. The Western Camino Real started at Buenos Aires, ran through San Luis and Mendoza, and ended at Santiago de Chile.[1] The road decreased in importance with the introduction of railways at the end of the 19th Century.