#bridge__span a structure that allows people or vehicles to cross an obstacle such as a river or canal or railway etc.
supertype: physical_structure__structure__construction a thing constructed; a complex construction or entity; "the structure consisted of a series of arches"; "she wore her hair in an amazing construction of whirls and ribbons"
subtype: Bailey_bridge cantilever_bridge cattle_guard covered_bridge drawbridge footbridge overpass pontoon_bridge rope_bridge steel_arch_bridge suspension_bridge trestle_bridge truss_bridge viaduct
part of: transportation_system
part: arch (architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it
part: keystone__headstone the central building block at the top of an arch or vault
part: springer__impost the lowest stone in an arch -- from which it springs
part: voussoir wedge-shaped stone building block used in constructing an arch or vault
part: pier a support for two adjacent bridge spans
part: trestle a supporting tower used to support a bridge
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