Another lane will be added to the Heads of the Valleys road between Bryn Mawr and Tredegar.
It follows the announcement of almost £82 million of European funding.
The A465 dualling scheme will see improvements to the 7.8km route which extends from the north of the A465 roundabout at Brynmawr and tie in with the previously improved A465 at Tredegar.
The work is likely to start early next year.
More top news
Wales has now become the first country in the UK to change the law governing organ donation to a soft opt-out system.
The strong winds will ease overnight, but heavy rain is likely in places. At least it will feel mild!
Road closures, fallen trees and flooding hit all parts of Wales.