Change of https://www.gov.uk/government/publications/common-analytical-scenarios-databook

Change description : 2025-10-16 09:30:00: Added forthcoming change: updates to TAG uncertainty guidance. [Guidance and regulation]

Showing diff : 2025-05-29 08:34:45.168893042 +00:00..2025-10-16 08:52:23.214662888 +00:00

Guidance

Common analytical scenarios databookdata book

A selection of data tables, published alongside the TAG uncertainty toolkit, to help consider and model the common analytical scenarios.

From:
Department for Transport
Published
8 August 2022
Last updated
2916 MayOctober 2025 — See all updates

Documents

Common analytical scenarios databookdata book

ODS, 2.52 MB

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Forthcoming change: updates to TAG uncertainty guidance

https://www.gov.uk/government/publications/tag-forthcoming-changes/forthcoming-change-updates-to-tag-uncertainty-guidance

Details

Detailed assumptions and inputs for modelling the common analytical scenarios (CAS) outlined within the Department for Transport’s TAG uncertainty toolkit.

The CAS databookdata book scenario grid (SG) explains the assumptions in each scenario. It supplements the TAG databookdata book, which should be used for all values pertaining to the core scenario.

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 8 August 2022
Last updated 2916 MayOctober 2025 + show all updates

  2. Common analytical scenarios databook updated.

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Update history

2025-12-11 10:00
‘Common analytical scenarios databook’ and ‘TAG uncertainty scenarios: upcoming changes’ updated.

2025-10-16 09:30
Added forthcoming change: updates to TAG uncertainty guidance.

2025-05-29 09:30
Common analytical scenarios databook updated.

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

2023-11-17 10:31
Error correction: correction to the values of time for the technology scenario.

2023-05-31 10:00
Updates made to marginal external costs, car costs and car and bus journey times.

2022-08-24 16:21
Corrected an error in the fuel efficiencies for the Mode-balanced Decarbonisation scenario.

2022-08-08 09:37
First published.