A483 - A489 Newtown Bypass

Client Corderoy / Welsh Government

The A483/A489 trunk roads at Newtown form part of the north-south and east-west transport corridors linking areas such as Mid Wales and the West Midlands. Newtown was a pinch point on the network and the junction of the A483(T) and A489(T) regularly suffered from traffic congestion. Further industrial development of Newtown was hampered by transport and congestion issues.

The project is one of the largest ever to be delivered in mid-Wales and entailed the construction of a new bypass around the southern edge of Newtown that crosses the Cambrian Railway and involves the bridging of several valleys and culverting a number of significant water courses that feed into the River Severn.

The highly complex scheme aimed to deliver several transport planning objectives such as maintaining the economic base of the town and reducing air pollution in the town centre. The A483/A489 Newtown Bypass consists of:

  • 5m3 tonnes of earthworks and extensive ground improvement works
  • New 6.1km 2+1 carriageway
  • 1km of new side roads on the side of the Severn Valley
  • Five new roundabouts providing connectivity to existing roads and improved access to the three main industrial areas in Newtown
  • 4 underpasses creating connectivity for land severed by the Bypass
  • Four underbridges taking the Bypass over existing features (one a railway crossing, one a 90m long, three span structure)
  • 7 attenuation ponds
  • 3 overbridges taking existing roads over the Bypass

The Welsh Government appointed an integrated Corderoy/Capita client-side Employer’s Agent team in 2012. Following which the team worked in true collaboration with Welsh Government to develop the £100m scheme through procurement to contract award, public inquiry, detailed design, construction and handover.

Our teams provided multi-disciplinary technical advisory services, including:

  • Engineering; highways, drainage, structures, road safety, traffic signage and road markings and geotechnical as ‘Overseeing Organisation’s Geotechnical Advisor’
  • Environmental
  • Land and orders; line order/ side roads order/ compulsory purchase order

Specialists provided ongoing technical advisory throughout all key stages of delivery and co-ordination of technical issues between the designer and contractor and on-site supervision, recording changes and managing them to ensure no delay to the construction programme.

Our role also included acting as NEC Supervisor to principal contractor Alun Griffiths, liaising closely with all key stakeholders and affected parties to help reduce impacts and ease the construction phase through to handover and aftercare.

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