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We are converting the A465 from Dowlais Top to Hirwaun to 2 lanes in each direction.

Under construction
Region / County:
south-east Wales
Start date:
early 2021
End date:
£590 million
First published:
28 September 2017
Last updated:


Why we are doing it

The objectives are to:

  • improve traffic flow and make it safer to overtake
  • make the road safer, especially around junctions and areas with poor visibility
  • improve access to key services, jobs and markets supporting inward investment to areas like the Ebbw Vale Enterprise Zone.

Current progress

The main work started at the end of May. 

The work includes:

  • laying a temporary road at Hirwaun and Trewaun to create space for the new road and 3 bridges  
  • installing culverts to carry water underneath the new road
  • putting up boundary fencing
  • demolishing buildings at Trewaun junction
  • building new bridges at Hirwaun junction, Tower road, Trewaun and Afon Cynon
  • building a new underpass at Court Farm
  • building temporary roads at Cefn Coed to enable High Street bridge to be closed

We are working on:


Public exhibitions: end 2015
Publication of draft orders and environmental statement: summer 2017
Publication of draft supplementary orders and supplementary environmental statement: early 2018
Public local inquiry: spring 2018
Minister's decision: early 2019
Making of Orders: spring 2019
Publish draft Supplementary Orders (No.1): autumn 2019
Making Supplementary Orders (No.1): summer 2020
Publish draft Supplementary Orders (No.2): summer 2020
Procure contractor: autumn 2020
Start of construction: early 2021
Completion of new section of trunk road: mid 2025

Next steps

Main building works will start during 2021. This will include:

  • starting to build the Rhigos junction 
  • with traffic now moved onto the temporary road layout, building new bridges at Hirwaun junction 
  • building bridges at Afon Cynon and the Vale of Neath railway line
  • building a new underpass at Court Farm
  • moving of ancient woodland at Croesbychan and starting to build the new Croesbychan junction
  • building new Swansea road link and the new junction at Baverstock
  • building a temporary road at the A470 to provide space for building the new road
  • building the foundations and supports for the new Taf Fawr viaduct
  • changing the road to build new retaining walls in Cefn Coed 
  • starting to build the new Prince Charles junction
  • building a new side road at Pant Industrial Estate
  • building the new westbound road between Bryniau road and Pant road to enable the construction of new bridge and retaining wall at Pant road
  • building temporary roundabouts at Dowlais junction to enable the new bridges to be built
  • moving existing utilities across the project.

What we are doing

This road project is known as the A465 Heads of the Valleys section 5 and 6. The project will extend between Hirwaun and Dowlais Top for 11 miles (17.7km).

It will leave  the current A465 between the Hirwaun and Trewaun junctions for about a mile (1.4km) and between the Taf Fechan Viaduct and the Gurnos Farm underpass for about half a mile (0.8km).

The new road will be a 70mph dual carriageway with 6 junctions.

Slip roads on and off the A465 carriageway will connect the joining roads.

How we are consulting

We consulted on improvements to the A465 between Abergavenny and Hirwaun in 1994 as part of the process to develop the preferred route for the whole project.

We held public information exhibitions in December 2015. At these events we presented the 1990s design and highlighted areas where we are considering options to improve this design.

We have run a series of presentations to local interest groups and meetings with local landowners, businesses and other key stakeholders. We have used these to gather information on and understand how the proposals fit with local priorities, objectives and policies.

We held a series of draft orders exhibitions in August 2017.

We held a public local Inquiry in April and May 2018.

Latest announcements

Announcements and notifications


Reports, environmental statements and plans


The legislation required for the project to proceed including drafts for public comment

Help and support

Ask a question about the project or report an issue

To report incidents or issues 24 hours a day please contact the A465 control room phone: 0800 865 4650

For community queries or complaints contact the public liaison officer. Croesawir galwadau yn Gymraeg / calls are welcomed in Welsh.