Bridge and highway product manufacturer DS Brown has extended its range of products through the acquisition of Exodermic Bridge Deck. Exodermic is a modular slab system designed to speed up construction while reducing dead load. Schemes that have used the Exodermic system include the Boston Central Artery I-93 viaduct, Eads Bridge over the Mississippi River in St Louis and the Tappan Zee Bridge in New York.