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beam bridge 
Bridge whose deck is composed of one or several beams, which are supported by piers across the open space.
overpass
Raised part of a road or highway on which traffic flows over another highway or obstacle.
pier
Sturdy load-bearing component placed at intervals to support the bridge’s beams.
underpass
Lowered part of a thoroughfare, enabling traffic to flow under another roadway or obstacle.
deck
Set of components making up the structure that carries the bridge’s traffic lanes.
abutment
A pier’s point of support on firm ground.
parapet
Chest-high barrier on each side of the deck, preventing people and vehicles from falling off.
continuous beam
Extended load-bearing part supported by abutments and piers.
