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Eastern Bay Link

Completed Projects

The Eastern Bay Link connects Queens Gate and Ocean Way Roundabout, improving access and connections to Cardiff Bay and the Cardiff Central Enterprise Zone from the M4 to the east within the Cardiff City Region. We delivered a design and construction solution that reduced journey times, enhanced road safety and improved resilience of Cardiff’s strategic road network.



Welsh Government / Cardiff City Council




2015 – 2017



The project was delivered under a NEC3 Option C contract, following a two stage Early Contractor Involvement (ECI) approach. The scope of the works include the design and construction of 1.2km of new dual carriageway, a 3.5m wide combined cycle / footway and improvements to two roundabouts, including diversions to existing highways. The alignment required a high-skew bridge to accommodate an existing dockland access road, two level-crossings and a railway line connecting CELSA’s Castle Works and Rolling Mill. In addition, ground contamination, reliance on land acquisition and phasing of significant major underground utility diversions in an environmentally sensitive location all presented additional constraints within a tight programme.

We have procured all imported slag material for the piling platforms and embankment construction and all reinforcement from the neighbouring CELSA works. We collaborated with the client, our designers, key stakeholders and statutory bodies to design an optimised solution that eliminates key construction risks. The increased costs of the new approach structures were offset by savings gained through utility diversions mitigation measures, this kept disruption to an absolute minimum.

We met our wider environmental and economic objectives, protecting and enhancing the adjacent Sites of Importance for Nature Conservation and Sites of Special Scientific Interest and executing an Archaeological Watching Brief with Gwent Glamorgan Archaeological Trust.


  • Offsite manufacture of viaduct components to remove interface issues with local stakeholders, achieving zero disruption to the 24/7 CELSA railway operations
  • Modified the client’s design from piled embankments to multi-span viaducts to avoid utility diversions and accelerate the programme
  • Achieved £4m efficiencies through early consultation with utilities companies to reduce the length of the Victorian sewer and electricity diversion. Also eliminated large diameter gas main and fibre optical cables diversions
  • Achieved over 400,000 RIDDOR-free hours
  • Delivered to CEEQUAL Excellent by protecting cultural heritage
  • Achieved 11% above Welsh Government KPI benchmarks
  • Partnered with the Prince’s Trust to form the Get into Construction Programme - providing training and employment to for local people
  • Finalist of the NEC Project of the Year 2017 award

“Improving infrastructure and transport links, reducing journey times and creating jobs has been a long term commitment for my Government and this major project is another example of how we are delivering on those promises.”

Carwyn Jones, Welsh first minister on the opening of Eastern Bay Link.


  • 1.2km new dual carriageway
  • 5% delivered under the Target Price budget
  • New 21-span viaduct
  • 2 roundabouts upgraded
  • 85% of the project alignment required utilities diversions
  • 70% of the road was re-designed from embankment to concrete structure

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