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Introduction of Arches reduces the bending moment at cross sections due to presence of horizontal force at the support whenever bridge is loaded and thus requirement of cross section is lesser. When triangles are easy to propagate and can have tension/compression only if used as 2-point member in bridges (forces acts only the end of any member not in between), Due to absence of bending moment it also reduces the cross-section requirement. Therefore, if we introduce arches and triangles cross section requirements of each small member get reduced.

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Q: Why was arches and triangles used in making a bridge?
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Related questions

What were arches used for before bridge building?

Apart from bridge building, arches are commonly used for doorways/openings. Throughout history arches have been used to spread vertical loads to create openings. Examples range from small garden arches to the Colosseum.

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Where the Arches Used To Be was created in 1935.

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