#trestle  a supporting tower used to support a bridge
  supertype:  supporting_tower  a tower that serves to support something
  part of:  bridge__span  a structure that allows people or vehicles to cross an obstacle such as a river or canal or railway etc.
     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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