Visit our collection of forgotten bridges and viaducts by clicking on their names below.

Have you ever wondered when a bridge becomes a viaduct? Of the five structures above, there can be little argument that the one furthest left is a bridge whilst far-right stands a viaduct. What would you define the three in the middle as?

The first looks upon a viaduct as being a structure with one or more intermediate supports, unless there's a local convention such as on the Thames where crossings are always known as bridges.

In a similar vein, the second - an experienced railway bridge examiner - generally regards a viaduct as having five or more spans.

The third considers a bridge to be any structure which either crosses a river or only has one span. A viaduct is used to take a railway over a valley.