airplane parking area {apron, airport}.
German highway {autobahn}.
raised wooden walkway {boardwalk}.
Elevated roads {causeway} can be across wetlands or water.
Highway interchanges {cloverleaf}, in which vehicles do not cross paths but only merge, can look like four-leaf clovers from above.
tall supporting frame {gantry}, as for rockets.
main telephone line {trunk line}.
elevated train structure {ell}.
city or subway {metro}.
railroad track beginning {railhead}.
Train engines turn around in buildings {roundhouse}.
Towers {semaphore} can have flags, arms, or lights that can go up or down.
Structures {trestle} can be under bridges, or horizontal bars can have end legs.
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Description of Outline of Knowledge Database
Date Modified: 2022.0225