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Guidance

TAG unit A2-1 wider economic impacts

Transport analysis guidance (TAG) on the analysis of wider economic impacts in transport appraisals.

Updates to this page

From:
Department for Transport
Published:
31 May 2019
Last updated:
28 May 2026
Show all updates

  1. TAG unit A2-1 updated.

  2. Added forthcoming change on the impacts of marginal external costs on GDP.

  3. Added TAG unit A2-1.

  4. TAG unit A2-1 wider economic impacts appraisal updated.

  5. Added 'Forthcoming change: update to wider economic impacts'.

  6. First published.

Documents

TAG unit A2-1 wider economic impacts appraisal

PDF, 775 KB, 59 pages

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Details

This document details the overall framework underpinning the analysis of wider economic impacts in transport appraisals.

The WITA software is in conjunction with this guidance to estimate the wider economic impacts of an appraisal.

The previous version of this guidance was published in May 2025.

TAG provides information on the role of transport modelling and appraisal, and how the transport appraisal process supports the development of investment decisions to support a business case.

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