New £1bn motorway to ease south Wales congestion
16 July 2014 Last updated at 21:51 BST
A £1bn relief road for the M4 around Newport has been confirmed by Welsh Transport Minister Edwina Hart.
It is the largest capital investment programme ever announced by the Welsh government.
Supporters say it will improve transport in south Wales, ease congestion and boost jobs.
But opponents have criticised the plan because of its environmental impact and one group has dubbed it a "billion pound mistake."
BBC Wales economics correspondent Sarah Dickins reports.