ABSTRACT
Four motorway underbridges have been replaced at the Peel Green roundabout, to the west of Manchester, as part of the M63 widening scheme. Consideration was given to retaining the existing structures and widening them, but the pretensioned beams forming the decks contained no shear reinforcement, which is required by BS 5400: Part 4:1984.1 It was decided to replace the bridge decks primarily for this reason.
