The Autostrada A1 or Autostrada del Sole ("Sun motorway") is the longest (760 kilometres (470Â mi)) autostrada (Italian for "motorway") in Italy, linking some of the largest cities of the country: Milan, Bologna, Florence, Rome, and Naples. The Autostrada A1 is located in the regions of Lombardy, Emilia-Romagna, Tuscany, Umbria, Lazio, and Campania. It is a part of the E35 and E45 European routes.