Change of https://www.gov.uk/government/publications/tag-unit-a3-environmental-impact-appraisal

Change description : 2025-10-16 09:30:00: Added forthcoming change: vehicle emissions carbon tool.. [Guidance and regulation]

Showing diff : 2025-05-29 08:35:06.358474545 +00:00..2025-10-16 08:53:16.929651093 +00:00

Guidance

TAG unit A3 environmental impact appraisal

Guidance on the analysis of environmental impacts in transport appraisals.

From:
Department for Transport
Published
31 May 2019
Last updated
2916 MayOctober 2025 — See all updates

Documents

TAG unit A3 environmental impact appraisal

PDF, 909 KB, 114 pages

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Forthcoming change: vehicle emissions carbon tool

https://www.gov.uk/government/publications/tag-forthcoming-changes/forthcoming-change-vehicle-emissions-carbon-tool

Details

This document gives guidance on environmental impact appraisal.

The previous version of this guidance was published 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 31 May 2019
Last updated 2916 MayOctober 2025 + show all updates

  2. Updated TAG unit A3.

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Update history

2025-12-11 10:00
TAG unit A3 updated.

2025-10-16 09:30
Added forthcoming change: vehicle emissions carbon tool..

2025-05-29 09:30
Updated TAG unit A3.

2024-11-28 10:00
Updated with forthcoming changes for May 2025.

2024-05-30 10:00
TAG unit A3 updated.

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

2023-11-30 10:00
TAG unit A3 guidance 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 unit A3 guidance updated.

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

2022-05-30 09:30
Unit A3 guidance updated.

2022-04-29 11:10
Forthcoming change to guidance note added, the note details guidance alterations to be implemented in May 2022.