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Grande Ravine viaduct, Reunion Island, France

As part of the construction of the New Coastal Highway on Reunion Island (which crosses more than 100 ravines and comprises 23 bridges, four viaducts, nine interchanges and three conventional and cut-and-cover tunnels), the Grande Ravine viaduct is an iconic structure, which stands out due to its height and the construction technique used to build it.

The project faced two challenges: cantilever construction of two prestressed braces from the counterweight abutments and launch of the 288-metre steel deck from the two abutments. The choice of method was dictated by the need to protect the environment.