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
The Bluebirds need two wins from their final three games to guarantee promotion.
Jeremy Corbyn will be the main speaker at a Welsh Labour conference coming to terms with Carwyn Jones' announcement of his departure.
Any heavy showers will clear away northeastwards through late evening.