The document discusses the Viaduct of Grande Ravine road project on Reunion Island. It was a 35km, 2x2 lane road project begun in 1980 and completed in 2009 to alleviate traffic congestion on the west coast as the population was expected to double by 2020. A key part of the project was the Viaduct of Grande Ravine, an exceptional 288m long, 3 part structure built to cross the Grande Ravine valley. It included 80,000 cubic meters of embankments, 12,000 cubic meters of reinforced concrete, and 3,500 tons of steel to support the roadway across the ravine.