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Guidance

Forthcoming changes and previous versions of TAG

Record of upcoming and past changes to transport analysis guidance (TAG), and previous versions of TAG.

Updates to this page

From:
Department for Transport
Published:
29 November 2018
Last updated:
28 May 2026
Show all updates

  1. Expired forthcoming change notes removed and added a spreadsheet outlining past forthcoming changes and versions of TAG.

  2. Added forthcoming changes on appraisal, Green Book, electric vehicle mileage share, impacts of marginal external costs on GDP, occupancy, journey purpose split and uncertainty guidance updates.

  3. Added forthcoming changes on updates to road freight values of travel time.

  4. Added forthcoming changes on updates to appraisal data, climate change adaptation guidance, TAG uncertainty guidance and variable demand modelling advice alongside a change introducing the vehicle emissions carbon tool.

  5. Added forthcoming changes about appraisal data, dependent development guidance and supplementary economic modelling.

  6. Added 'Forthcoming change: base year update' and 'Forthcoming change: operating cost parameters'.

  7. Added forthcoming change notices about guidance on the appraisal of new modes, wider economic impacts updates, and updates to economic and demographic data and clarified guidance on rail appraisal.

  8. TAG: forthcoming changes updated.

  9. Added 'Forthcoming change: spring 2024 data book and guidance updates' and 'Forthcoming change: modelling guidance updates'.

  10. Added forthcoming changes about appraisal guidance updates and a new TAG unit on spending objective analysis.

  11. Added forthcoming change about carbon valuation.

  12. Added forthcoming change: spring 2023 data book and guidance updates.

  13. Added forthcoming change: accounting for COVID-19 in transport modelling.

  14. Updates to guidance on forecasting and uncertainty.

  15. Expired forthcoming change notes removed.

  16. First published.

Documents

TAG: forthcoming changes

HTML

Previous forthcoming changes and versions of TAG

MS Excel Spreadsheet, 69.3 KB

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Details

Planned updates to transport analysis guidance (TAG), including details of the guidance being updated and planned dates of release in line with the TAG orderly release process.

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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