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The Hirwaun junction will connect Brecon road, Hirwaun road and the current A465 road, and allow the new A465 dual carriageway to pass below the junction.

First published:
15 September 2021
Last updated:
Map showing Hirwaun junction plans.​​​​
Map showing Hirwaun junction plans.​​​​

What we’re doing

  • archaeological investigations
  • demolishing existing properties
  • laying temporary road
  • building bridges
  • installing drainage and culverts
  • moving utilities
  • building a roundabout

To build this road, we will cut up to 40 feet (12.5 metres) into the surface.

We will build a bridge built over the A465 to provide access to the Mynydd Bwllfa wind farm.

We will build a roundabout at Trewaun to connect Penywaun and Hirwaun. We will build 2 bridges to connect Brecon road to the A465.

We will build a temporary road to provide space for the new road. There will be no access to the A465 at the new Hirwaun Junction.

Current progress

We have:

  • cleared vegetation and site to prepare for construction.
  • undertaken archaeological investigation next to the windfarm access road.
  • diverted utilities to move services from the construction area.
  • demolished building within the scheme area.
  • constructed new Hirwaun West Bridge substructure, erected precast concrete beams for bridge deck construction.
  • constructed new temporary highway to create space to build the Hirwaun East bridge.
  • diverted traffic onto temporary roundabout to allow for bridge construction.
  • installed new drainage culvert under Hirwaun Road.
  • commenced construction of the Hirwaun East bridge.
  • temporary road opened on A465 to create space to build Trewaun retaining walls.
Works at Trewaun
Works at Trewaun
Works at Trewaun
Works at Trewaun

Next steps

  • constructing a retaining wall next to the houses in Trewaun.
  • extending the temporary road from Tramway to a new temporary roundabout to be located to the west of the current layout at the Hirwaun (Trewaun) junction.
  • relocating the temporary roundabout at Hirwaun (Trewaun) to a new location further east at Windfarm Road.
  • commence construction of new westbound A465 carriageway between Vale of Neath and Hirwaun. 
  • ongoing work to construct Hirwaun East overbridge that will connect Brecon Road to Hirwaun Road (A4059).

For traffic news on this junction, visit Traffic Wales.