The Welsh Government has started the pre-qualification process for the £800m M4 corridor extension project.
Five firms are expected to be shortlisted for the job, which will start in Spring 2018 and finish in 2022. The project marks the largest capital investment programme in Wales since devolution.
The 14 mile motorway between junctions 23 and 29 will include a new crossing of the River Usk and will see the existing M4 motorway being re-classified as a trunk road.
The project was originally proposed in 1991 before being dropped by the Welsh Assembly in 2009 because of rising costs. Plans were resurrected in 2011, when a toll motorway was proposed before the Treasury indicated that it would support a public funded project last year.
Last week, Welsh Transport Ninister Edwina Hart granted the ‘black route’ portion for the stretch between Magor and Castleton, which is expected to cost around £1bn.
PQQ documents are available on the eTenderWales procurement portal, with project code: PQQ_3157 Project_26608