#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:  arch  pier  trestle
  part of:  transportation_system__transportation__transit  facility consisting of the roads and equipment necessary for the movement of passengers or goods
     part of:  infrastructure__base  the stock of basic facilities and capital equipment needed for the functioning of a country or area; "the industrial base of Japan"

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