sentences:  Following the 1000km Nürburgring the previous year, this would make the Buenos Aires round only the second event in the series history.A circuit using long sections of the Avenida General Paz highway attached to the Autodromo section used only by Formula One would be used for the first 1000 km event.In 1955, an even longer section of the Autopista General Pablo Riccheri route would be added, making the circuit in length before it returned to its original size once again in 1956.