Structurally identical, viaducts and bridges play a similar role as footbridges. They are built to span one or more natural or artificial obstacles (watercourses, ravines, railways, roads, etc.) and allow users to get from one point to another. The two works are, however, theoretically different: the viaducts, more imposing by their length and height, often make it possible to cross several obstacles and serve several destinations. In reality, as here for the 354 ft (108 m) long and 98.4 ft (30 m) high Clécy Viaduct, which spans only the Orne to connect different parts of the commune of Clécy, it is not uncommon to use the term viaduct for bridges and vice versa.