Avenida General Paz (official name Ruta Nacional A001 - National Route A001) is a beltway freeway surrounding the city of Buenos Aires. Roughly following the boundary between the city and Buenos Aires Province, it is one of the few motorways in Argentina that is toll-free. It carries three lanes of traffic in each direction during most of its length, and five lanes between the Pan-American Highway and the Río de La Plata. There are feeder roads in both directions and there are service areas along its length, usually with a gas station and fast food restaurants.
Federal law number 2,089 of 1887 established the limits of the city of Buenos Aires, including the Partidos of Belgrano and San José de Flores. In Article 6 it declared that a road was to be built to delimit these with the city of Buenos Aires. Due to the plan of drawing straight lines for the road, an exchange of land was made between the Capital Federal and Buenos Aires Province.