A20 Roundhill Viaducts

An alternative design of two viaducts built using the glued segmental balanced cantilever system. Individual viaduct lengths of 340.2 m and 384.08 m are made up of spans typically of 60 and 63 m. The viaducts form part of the road improvements for the A20 Folkestone to Dover route. A complete redesign of the supporting columns and foundation was also undertaken, taking into consideration the Channel Tunnel which crosses the site within 1 m of finished ground level.