Viaduct - Pont d'Ouche Produced as part of the broad highway program of the 1960s, the viaduct of Pont d'Ouche is one of the major elements of the A6. At the time of its construction, it is primarily a unique work of art in its kind by its geometric characteristics, because it is built on a curve and on slopes, the viaduct accuses a total length of 504m. It is also an undeniable success, which enabled its completion in record time of 20 months, and it opened October 29, 1970. Supported by 13 pile gantry, the road rises to an average height of 23m.