Actual construction of the £800m scheme is likely to be some years away yet but the Welsh government has published a contract notice on an early contractor involvement (ECI) basis.
To combat local congestion on the M4, the plan is to build a new stretch of three-lane motorway to the south of Newport and reclassify the existing M4 between Magor and Castleton as a non-motorway. An additional new connection between the M4, M48 and B4245 would provide relief to Junction 23A and to the local road network.
The aims is to publish draft orders in spring 2016, hold a public inquiry in winter 2016/2017 and start construction in spring 2018. Completion of motorway construction is envisaged for autumn 2021 and overall project completion for spring 2022.
Arup is on board as the Welsh government’s consulting engineer.
For more details of the bidding process, see our Contract Leads section