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<p>Her Majesty’s Government employs a relevant, robust and trusted analytical process
designed to assess the likely impacts of both individual strategic road schemes and
our road investment strategy as a whole. The impacts of such schemes on, for example,
carbon, employment, housing, air quality and environmental issues are all assessed
by the Department in line with its Transport Analysis Guidance (TAG).</p><p> </p><p>The
Department keeps its appraisal and modelling methodologies which are set out in TAG,
under constant review, commissioning research to improve the evidence base as well
as improving methodologies. The recently published TAG route map sets out our plans
to update our guidance over the next six months and includes plans to update carbon
values once these are finalised by the Department of Business, Energy and Industrial
Strategy (BEIS).</p><p> </p>
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