#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

No statement uses or specializes #bridge; click here to add one.