8km of the A465 between the Glanbaiden junction at Gilwern and the Brynmawr roundabout has been converted into 2 lanes in each direction.
Mae 8km o’r A465 rhwng cyffordd Glanbaiden yng Ngilwern a chylchfan Bryn-mawr wedi’i droi’n ddwy lôn i’r ddau gyfeiriad.