Some of the key features of Roman bridges were:
1. Arches: Roman bridges were known for their characteristic arches made of stone or brick. These arches were strong enough to withstand heavy loads and were designed in different shapes like semi-circular, pointed or horse-shoe shaped.
2. Piers: The arches were supported by piers or pillars that were constructed in a straight line or in a curved pattern. These piers were made of stone or concrete and were often decorated with carvings and sculptures.
3. Keystones: The central stone block placed at the highest point of the arch is called a keystone. These keystones were precisely cut and fitted to ensure that the arch would remain stable.
4. Spandrels: The area between the arch and the top of the pier is called spandrel. These were often decorated with sculptures or mosaics.
5. Drainage: Roman bridges incorporated drainage systems to prevent water damage or erosion.
6. Roadway: The bridge spanned across a river or a valley and was designed to provide a smooth roadway for travel. The roadway was often made of stone or timber planks.
7. Monumental: Many Roman bridges were constructed to serve as monuments and could be adorned with elaborate decorations like statues or inscriptions.
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