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Accelerating the decarbonisation of Scotland’s infrastructure

Cross Tay Link Road

We’re proud to share the news that our work on the Cross Tay Link Road (CTLR) project has been showcased as a best practice case study in the new ‘Accelerating the Decarbonisation of Scotland’s Infrastructure’ report from ICE Scotland. We’re extremely proud to be Transforming Society Together with Perth & Kinross Council on this one…

Extract from the Institution of Civil Engineers (Scotland) 2022 report…

The Cross Tay Link Road (CTLR) will link the A9 over the River Tay to the A93 and A94 north of Scone. This will help to alleviate traffic congestion in the city centre and Bridgend, creating capacity in the city’s road network that will enable a shift to greener modes of travel, and facilitating sustainable economic development of Perth and the surrounding area. Carbon management has been at the heart of this project with opportunities to reduce emissions associated with the creation of the asset during the construction phase being explored from the start.

This has been accomplished by integrating the carbon management process within PAS 2080 into design choices and decision making then further into the procurement and delivery stages. An initial carbon baseline was developed prior to development of the specimen design to identify carbon hotspots. Over the course of the design process, various value engineering modifications were incorporated by Sweco which resulted in associated carbon savings from earthworks, structures and pavements of some 13,000 tCO2e.

In addition to the carbon emissions minimised during the specimen design, it was recognised that it was important to ensure that PAS 2080 would be incorporated during detailed design and construction. To achieve this, Sweco worked with Perth and Kinross Council to integrate carbon management within the procurement of the works contract. Tenderers were challenged to propose projects that would result in a minimum saving of 14,100 tCO2e of CO2e compared with the specimen design carbon footprint. This element of the tender was weighted at 15% of the evaluation criteria, with the maximum reduction being awarded the highest score. This ensured serious consideration was given to this element.

Through this process, a commitment was established within the tender requirements for the successful contractor to deliver its proposed carbon savings during construction. The successful supplier submitted a proposal in excess of the 14,100 tCO2e target. The project is currently in the design phase, and the design and procurement process together are expected to result in a 26,300 tCO2e saving of carbon compared to the baseline design.


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