#footbridge__overcrossing__pedestrian_bridge  a bridge designed for pedestrians
  supertype:  #bridge__span  a structure that allows people or vehicles to cross an obstacle such as a river or canal or railway etc.
  subtype:  #gangplank__gangboard__gangway  a temporary bridge for getting on and off a vessel at dockside
  subtype:  #jetbridge  an extendible bridge for loading passengers onto large commerical airplanes; provides protected access to the plane from the gate

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