Costain has announced a series of proposed full-weekend road closures of the A465 Heads of the Valleys road between Brynmawr and Glanbaiden

The closures will be from 8.30pm on Friday July 1 to 6am on Monday July 4; 8.30pm on Saturday July 8 to 6am on Monday July 11 and 8.30pm on Friday July 15 to 6am on Monday July 18.

The Glanbaiden roundabout, however, will remain open, giving traffic from the Abergavenny side access to Gilwern.

During the course of the closures full access will be maintained through the site for emergency services vehicles, which will be escorted by Costain’s traffic management team. Controlled access will be maintained across the closure at the Saleyard and Gilwern junctions.

A minibus service will replace the Stagecoach Service 3 on all three Saturdays.

The new dates and timings in July have been drawn up following the cancellation of the proposed closure on June 18 due to the weather conditions.

Costain staff will be working at high level above the carriageway in the Gorge in preparation for excavation and removal of rock, the existing rock face netting, boulders and tree stumps between Pont Harri and Nany yr Hafod.

There will be trial rock fracturing and rock breaking, with rock transport between the Welsh Water Sewage Treatment Works and Water Treatment Work.