 The subsequent automobile boom and the growth of northside neighborhoods and suburbs led Mayor Manuel Iricíbar in 1968 to order the extension of the avenue northwards into the Belgrano and Núñez neighborhoods.The extension was facilitated by a tunnel and by the widening of Blandengues Street, which became part of Avenida del Libertador.Thus connected to the avenue of the same name north of Buenos Aires, Libertador's entry into the suburb of Vicente López via a roundabout was replaced by a freeway underpass and its boulevard medians, removed.