State road 45

Machine-translated from the Italian article

State Road 45 of Val Trebbia (SS 45) is an Italian state road connecting the cities of Genoa and Piacenza and, therefore, the Ligurian Sea coast with the Po Valley. It begins on the outskirts of Genoa in the district of Struppa on Via di Sponda Nuova, near the Galleria della Paglia tunnel, and ends on the outskirts of Piacenza in the Galleana district near the ring road, after crossing the Ligurian Apennines through the Val Bisagno, the Val Scrivia and the Val Trebbia, and passing through Bobbio. The ancient route connecting Genoa and Piacenza via Bobbio was already known in the Middle Ages as Caminus Genue (Janue, Januae or Ianuae). According to some eighteenth-century accounts, the historical route ascended the left bank of the Val Bisagno as far as Cavassolo, where it crossed to the right bank via the seventeenth-century bridge-canal; still on the right bank, the itinerary passed through Davagna and then reached the Scoffera pass.