Original document : https://www.gov.uk/government/publications/tag-data-book

Change description : 2025-04-17 09:30:00: Added ‘Forthcoming change: appraisal data update’. [Guidance and regulation]

Showing diff : 2024-11-28 10:09:17.250709664 +00:00..2025-04-17 08:31:35.547250547 +00:00

Guidance

TAG data book

Historical and reference information on all the appraisal and modelling values referred to in the transport analysis guidance (TAG).

From:
Department for Transport
Published
29 November 2018
Last updated
2817 NovemberApril 20242025 — See all updates

Documents

TAG data book

5.55 MB

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TAG data book, including forthcoming changes forannounced Mayin 2025November 2024

5.57 MB

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Forthcoming change: appraisal data update

https://www.gov.uk/government/publications/tag-forthcoming-changes/forthcoming-change-appraisal-data-update

Forthcoming change: base year update

https://www.gov.uk/government/publications/tag-forthcoming-changes/forthcoming-change-base-year-update

Forthcoming change: operating cost parameters

https://www.gov.uk/government/publications/tag-forthcoming-changes/forthcoming-change-operating-cost-parameters

Details

The TAG data book provides all of the appraisal and modelling values referred to in TAG guidance. The data book features historical information and factual reference information about the appraisal and modelling values.

The previous version, TAG data book v1.23, was released in May 2024.

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.

Updates to this page

Published 29 November 2018
Last updated 2817 NovemberApril 2024 + show2025 href="#full-history">+ show all updates

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Update history

2025-04-17 09:30
Added ‘Forthcoming change: appraisal data update’.

2024-11-28 10:00
TAG data book updated and forthcoming changes for May 2025 added.

2024-10-17 09:30
Added ‘Forthcoming change: updates to economic and demographic data and clarified guidance on rail appraisal’.

2024-05-30 10:00
Unit updated and May 2024 forthcoming change note removed.

2024-04-25 10:00
Forthcoming changes added.

2023-11-30 10:00
TAG data book updated.

2023-10-19 10:00
Added forthcoming change about appraisal guidance updates.

2023-10-06 09:30
Added forthcoming change about carbon valuation.

2023-05-31 10:00
TAG data book updated.

2023-04-19 09:43
Added forthcoming change: spring 2023 data book and guidance updates.

2023-01-18 09:20
TAG data book updated.

2022-11-30 14:57
TAG data book updated.

2022-10-19 15:46
Forthcoming changes for November 2022.

2022-06-16 09:41
Tables A1.3.11 and A1.3.12 in ‘TAG data book: fleet assumptions’ have been corrected to reflect the addition of electric PSV energy consumption parameters.

2022-05-30 09:30
Updated TAG data book. Added data book: fleet assumptions, and a forthcoming change note on fleet assumptions.

2022-04-29 11:09
Forthcoming change to guidance note added, the note details guidance alterations to be implemented in May 2022.