The forces on this bridge

Compression and Tension- Every bar in this cantilever bridge experiences either a pushing or pulling force. The bars rarely bend. This is why cantilever bridges can span farther than beam bridges.f

The truss bridge consists of an assembly of triangles. Truss bridges are commonly made from a series of straight, steel bars. Rigid arms extend from both sides of two piers. Diagonal steel tubes, projecting from the top and bottom of each pier, hold the arms in place. The arms that project toward the middle are only supported on one side, like really strong diving boards. These "diving boards," called cantilever arms, support a third, central span.

The Truss Bridge

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TYPES OF BRIDGES

HOW DO I KNOW?
When identifying a truss bridge look for triangles