To achieve extended spans and keep the height of the construction to a minimum, a bridge can be provided with additional support in the form of a primary framework. This framework can be constructed in a number of different ways to achieve the optimum result and to ensure the bridge blends in well with its surroundings.

King post truss bridges Hanging trusses make extended spans possible while keeping the bridge deck at a relatively low height.

 

Arch bridges In cases where the span is extended further, the king post trusses can be replaced with overhead or underslung arches. The illustration shows an overhead arch.

 

Cable stayed bridges A cable stayed bridge is supported using pylons from which stays extend and are attached to the bridge deck. Suspending the deck by using stays allows for larger spans than would be possible with arch bridges.