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People used trees that fell over the rivers in order to cross
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Planks would allow to cross even wider streams and rivers
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Made of late slabs of stone in early bridges
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Early people used creepers and vines to make ropes and use these to make hanging bridges
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The first beam bridge
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Has a load bearing superstructure composed of a truss.
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a bridge in which the weight of the deck is supported by vertical cables suspended from further cables that run between towers and are anchored in abutments at each end.
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A viaduct is a long bridge-like structure carrying a road or railway across a valley or other low ground.
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A bridge built using cantilevers.
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A bridge in which the weight of the deck is supported by a number of cables running directly to one or more towers.