Guidance: TAG unit A3 environmental impact appraisal

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Department For Transport

November 30

10:00 2023

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TAG unit A3 environmental impact appraisal

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Details

This document gives guidance on environmental impact appraisal.

The previous version of this guidance was published in May 2023.

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.

Published 31 May 2019
Last updated 30 November 2023 +show all updates

30 November 2023
TAG unit A3 guidance updated.
19 October 2023
Added forthcoming change about appraisal guidance updates.
6 October 2023
Added forthcoming change about carbon valuation.
31 May 2023
TAG unit A3 guidance updated.
19 April 2023
Added forthcoming change: spring 2023 data book and guidance updates
30 May 2022
Unit A3 guidance updated.
29 April 2022
Forthcoming change to guidance note added, the note details guidance alterations to be implemented in May 2022.
30 July 2021
Updated with new version of unit A3 guidance.
19 May 2021
Updated TAG unit A3 guidance.
13 August 2019
NO2 changed back to NOx in 3.2.7 following Department for Environment, Food & Rural Affairs clarification.
6 August 2019
Information updated for technical errors NOx changed from NO2 in 3.2.7 and 3.4.4.
31 May 2019
First published.

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