 The agreement for its realization was sanctioned at Arles on September 22, 1478 and the excavation works of the tunnel began in the summer of 1479, when the snow melted.For this reason the work was interrupted in the winter and was completed at the end of the summer of 1480 under the direction of the engineers Martino di Albano and Baldassarre of Piasco, with a total cost of 12,000 florins.After the completion of the work in 1481, there was an increase in commercial traffic, and the Monte Viso Tunnel became a strategic route for the transit of goods.