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a true arch made from wedge shaped stone blocks that fit tightly together against abutments
the mass of rock or concrete at either end of an arch bridge that keeps the ends of the arch securely in place so they do not seperate and cause the bridge to fall
hand or gaurd rail
a safety feature added to the sides of the bridge's deck to prevent people, animals or cars from falling from the bridge
a strong, supporting beam
an object that holds up the bridge and serve as a foundation
a building concept, using triangles, made from squares, to enhance the strenth of the structure