A concrete solution

摘要

Without them, our travel network would collapse. There are nearly 100,000 bridges in the UK, the majority of which are small, local authority-owned structures (81,000); the rest comprises highways (8,500); and rail bridges (7,000). Three-quarters of all highways bridges consist of reinforced concrete, and while concrete makes up he majority of rail bridges, these structures are also made of other materials such as cast and wrought iron.