Nel 2015 l’indice del costo di costruzione del tronco stradale con tratto di strada in galleria segna un calo tendenziale dello 0,9%; il tronco stradale senza tratto di strada in galleria diminuisce dell’1%. Si rilevano riduzioni nella media del costo dei materiali, dei trasporti e dei noli, mentre aumenta il costo della manodopera
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