#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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