Arch bridge

Definition: A type of bridge in which its weight is carried outward along the curve to supports at each end.

Context: One of the oldest connecting structures, arch bridges can have a span of up to 1,700 feet.

Example: The Roman Alcántara Bridge, Spain (built 103-106 AD)

By Dantla from de.wikipedia - Own work, GFDL, https://commons.wikimedia.org/w/index.php?curid=455958

beam bridge

Definition: A simple type of bridge composed of horizontal beams supported by vertical posts

Context: Hundreds of workers helped build vertical supports for the beam bridge.

By Rich Niewiroski Jr. - http://www.projectrich.com/gallery, CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=1520007

cable-stayed bridge

Definition: A bridge in which the roadway deck is suspended from cables anchored to one or more towers.

Context: Unlike suspension bridges, cable-stayed bridges do not block a driver's view of the water.

By Jorchr - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=51733078

cantilever bridge

Definition: A projecting structure supported only at one end, much like a shelf bracket or a diving board.

By Kakidai - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=37667658

suspension bridge

Definition: A bridge in which the roadway is hung from strong cables that pass over two towers.

By Siyuwj - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=16218000