Modernization and adaptation works of "Motorway A3 Salerno - Reggio Calabria" from junction Sicignano (km 53,800) to junction Atena Lucana (km 82,330). Autostrada A3 Salerno - Reggio Calabria is one of the most important and troubled works of the Italian infrastructural system. SGAI S.r.l. interventions are included into first "macro lot" and included: 3 junctions, 23 viaducts, 5 galleries and 350 works. They are part of wider program of entire infrastructure modernization, in order to make it more safe and confortable and also to have a shorter route. First "macro lot" is the union of 4 previous smaller lots (4 separate projects), and belongs to plan of strategic interventions of overriding national interest provided by Objective Law. In Italy was the firt experience to entrust the opera to a general contractor. SGAI S.r.l. was responsible to revise the detailed design, variations during construction design, maintenance plan. SGAI S.r.l. did also as built editing of 28.530 km of road, considering sections extension of road in service and realisation of new revised segments. In this projet SGAI S.r.l. design some works that can be summarized in the following sectors: geotechnical, civil engineering, structural, roads, drainage and hydraulic regulation, roads lighting systems.