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The Romans were the world's first major bridge builders. The following list constitutes an attempt to list all known Roman bridges, many of which still survive to this day. A Roman bridge in the sense of this article includes any of these features: *Roman arches *Roman pillars *Roman foundations *Roman abutments *Roman roadway *Roman cutwaters Also listed are bridges which feature substantially Roman material (spolia), as long as the later bridge is erected on the site of a Roman precursor. Finally, incidences where only inscriptions lay testimony to a former Roman bridge are also included. In the following, bridges are classified either according to their material or their function. Most data not otherwise marked comes from O’Connor's ''Roman Bridges'' which lists 330 stone bridges for traffic, 34 timber bridges and 54 aqueduct bridges. An even larger compilation of more than 900 Roman bridges (as of 2011) is offered by the Italian scholar Galliazzo, which is used here only selectively. == Note on classification == Bridges are particularly difficult to classify as they, more than other structures, are subject to wear, on account of war and the impact of natural elements. The constant need for repairs through the ages has often turned bridges into hybrid structures, making it often difficult or nearly impossible to determine the exact date and origin of individual parts of a bridge. Thus, the majority of bridges listed below can be assumed to include medieval or (early) modern modifications, replacements or extensions, to a small or large extent. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of Roman bridges」の詳細全文を読む スポンサード リンク
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