Highways England is in the process of identifying potential routes within the preferred corridor for the Oxford to Cambridge expressway for a non-statutory public consultation in the autumn. This work will include an assessment of environmental impacts, including carbon emissions using the Defra forecasts for emission rates. Conserving and enhancing the natural environment is at the heart of the growth ambitions for the Oxford-Cambridge Arc. Any housing development in the Arc will be subject to assessments as appropriate in line with legal requirements.