For the design of the entrance and exit ramps of the A32 at the Susa Terminal Interchange viaducts have been used. The first segment of the deck is developed on four spans whose maximum length is 24m and composed of a double steel beam and composite concrete slab. The study of the design slopes highlighted the need for a very shallow structure overpass at the crossing with the highway lane required in order to allow a sufficient free height on the highway lane.
This need lead to the idea to introduce a cable-stayed bridge over passing the whole lanes on both drive sides. The bridge is composed of two spans, each 45.36m long, with two end piers and a central mast supporting seven suspension cables for each of the two spans of the deck. Seven cables are provided along each span. Proceeding in the northern direction, the viaduct will be characterised by an additional two or three span deck, whose maximum length is 24m, composed of a double-beam structure and composite concrete slab.