In the 4-lane adjustment of the S.R. n. 2 “Via CASSIA” it has been used BIM methodology (Building Infrastructures Modeling) for the design of 5 viaducts and 17 overpasses, all the works are made of mixed steel-concrete structure. The Santa Giulia viaduct is the main work with a mixed deck with a 3-lane interlocked parabolic intrados with a total length of 200 m. and central span of 80 m.