M25 junctions 12-15 widening and M25 spur road, London

An aerial view of a road construction project

About the Project

Project Information
  • Client: Highways Agency/BAA
  • Principal designer: WSP
  • Principal contractor: Balfour Beatty Civil Engineering
  • Principal engineer: Gifford WSP
  • Contract value: 147 million

This project entailed the successful widening of Europe's busiest motorway whilst maintaining traffic flow.

The scheme, which included new railway bridges and a new interchange serving Heathrow's new Terminal 5, minimised disturbance to traffic and local communities.

On the safety side, a million man hours passed without an accident; on sustainability, 90 per cent of material generated by the project was re-used, and in terms of innovation, the project involved pre-cast, pre-assembled modules which reduced complexity on site to enhance safety, quality and programme performance.

Part of the success was down to continual monitoring, with a project board representing all stakeholders reviewing progress bi-monthly. It was in that sense 'owned' by the teams.

The value of partnering was shown when an early setback meant the job ran nine weeks behind schedule but was delivered three weeks early, and to a fixed price. Community benefits included a low noise wearing surface, less congestion from improved junctions and reduced dust, water and light pollution.

The judges said: 'Teamwork was the hallmark of a difficult project which was completed on time and to budget, with an impressive safety record.'

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