#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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