Last week Transport minister Edwina Hart approved plans for the road after a public consultation took place.
The 23km three-lane motorway will be built between junctions 23 and 29 south of Newport, alongside complementary measures that include:
- Reclassifying the existing M4 between Magor and Castleton
- An M4/M48/B4245 connection
- Providing cycling friendly infrastructure
- Providing walking friendly infrastructure.
The project will get underway in Spring 2018 and should be completed by 2022.
Any contractors interested in bidding for the job are invited to do so via the eTenderWales portal https://etenderwales.bravosolution.co.uk