The article discusses the design and construction of composite slab and girder bridges, focusing on the Leven Bridge at Ulverstone. The researchers conducted experiments to reinforce a structure with a concrete deck slab supported by steel joists, which proved successful. They built a test bridge and a scale model to test load distribution. The Leven Bridge, a four-beam bridge with seven spans, was described as a cost-effective and structurally sound solution to replace an old timber bridge.