The M4 Corridor around Newport motorway is a 22.7km re-routing of the M4, from Junction 23 (east) to Junction 29 (west), to the south of Newport. The project involves major junction works, stretches of new carriageway across poor ground in ecologically sensitive areas, plus significant viaducts and bridges over the River Usk and Newport Docks.
In March 2015 Welsh Government appointed CVJV (the Costain, Taylor Woodrow and VINCI Construction Grands Projets joint venture) on an Early Contractor Involvement (ECI) contract to assist in developing the scheme through Key Stages 3, 3a and 4, i.e. through Publication of Draft Orders, Environmental Statement and associated reporting, public exhibitions, and public local inquiry. Success in this will enable a decision by Welsh Government to start construction (Key Stage 6), probably in Spring 2018.