Common analytical scenarios databook
A selection of data tables, published alongside the TAG uncertainty toolkit, to help consider and model the common analytical scenarios.
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- Published
- 8 August 2022
- Last updated
-
29
28MayNovember20252024— See all updates
Documents
Common analytical scenarios databook
ODS, 2.52 MB
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Common analytical scenarios databookdatabook, including forthcoming changes for May 2025
ODS, 2.52 MB
This file is in an OpenDocument format
This file may not be suitable for users of assistive technology.
Request an accessible format.
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email webmasterdft@dft.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.
Forthcoming change: base year update
https://www.gov.uk/government/publications/tag-forthcoming-changes/forthcoming-change-base-year-update
Details
Detailed assumptions and inputs for modelling the common analytical scenarios (CAS) outlined within the Department for Transport’s TAG uncertainty toolkit.
The CAS databook scenario grid (SG) explains the assumptions in each scenario. It supplements the TAG databook, 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.
Common analytical scenarios databook
ODS, 2.52 MB
This file is in an OpenDocument format
This file may not be suitable for users of assistive technology.
Request an accessible format.
Common analytical scenarios databookdatabook, including forthcoming changes for May 2025
ODS, 2.52 MB
This file is in an OpenDocument format
This file may not be suitable for users of assistive technology.
Request an accessible format.
Forthcoming change: base year update
https://www.gov.uk/government/publications/tag-forthcoming-changes/forthcoming-change-base-year-update
Details
Detailed assumptions and inputs for modelling the common analytical scenarios (CAS) outlined within the Department for Transport’s TAG uncertainty toolkit.
The CAS databook scenario grid (SG) explains the assumptions in each scenario. It supplements the TAG databook, 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
Last updated 29
-
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.