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The Croesbychan junction will connect Hirwaun and Llwydcoed.

First published:
15 September 2021
Last updated:
map showing Croesbychan junction plan
Map showing Croesbychan junction plan

What we’re doing

  • moving and re-planting ancient woodland
  • laying a temporary road
  • moving utilities
  • building a bridge over the Vale of Neath railway line
  • building a new road and roundabouts

We will build a new junction to replace the existing one. The junction and the road will be built mostly on embankment up to 42 ft (13m) high.

We will also build a viaduct over the Nant Melyn watercourse, which will carry the new A465. The existing Nant Melyn Viaduct will be used by Non-Motorized Users (NMUs) only.

We will build a temporary road to provide space for construction of the permanent road.

The work will be done in phases.

Current progress

We have:

  • carried out environmental surveys
  • cleared vegetation ready for work to start
  • started to prepare the site to move utilities
  • built a temporary roundabout to the west of Court Lodge Underbridge
  • installed fencing
  • built two new permanent roundabouts and connecting roads to update the local road network
  • began building the new Nant Melyn Viaduct
  • created new habitats for dormice and enhanced existing dormice habitats
  • started building the Vale of Neath Railway bridge abutments
Works at Croesbychan
Works at Croesbychan

Next steps

  • Continue to monitor Dormice habitats   
  • Ongoing building of Vale of Neath Railway bridge, Croesbychan and Court Lodge underbridges  
  • Continue building the Nant Melyn Viaduct

For traffic news on this junction, visit Traffic Wales.