Guidance

TAG unit M4 forecasting and uncertainty

Transport analysisAnalysis guidanceGuidance (TAG) provides information on the role of transport modelling and appraisal.

From:
Department for Transport
Published
31 May 2019
Last updated
3119 MayApril 2023 — See all updates

Documents

TAG unit M4 forecasting and uncertainty

PDF, 465618 KB, 5752 pages

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: spring 2023 data book and guidance updates

https://www.gov.uk/government/publications/tag-forthcoming-changes/forthcoming-change-spring-2023-data-book-and-guidance-updates

Forthcoming change: accounting for COVID-19 in transport modelling

https://www.gov.uk/government/publications/tag-forthcoming-changes/forthcoming-change-accounting-for-covid-19-in-transport-modelling

Forthcoming change: high and low growth scenarios and awareness of future updates

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

Details

This document gives guidance on the analysis of forecasting and uncertainty in transport appraisals.

The guidance is supplemented by the Uncertainty Toolkit.

The previous version of this guidance was released in NovemberMay 20222019.

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 3119 MayApril 2023 + show all updates

  1. TAG unit M4 updated.

  2. Added forthcoming change: spring 2023 data book and guidance updates.

  3. Added forthcoming change: accounting for COVID-19 in transport modelling.

  4. TAG unit M4 forecasting and uncertainty updated.

  5. Forthcoming change to guidance note added, giving details of updates to be made in November 2022.

  6. First published.