Guidance

TAG unit M4 forecasting and uncertainty

Transport analysis guidance (TAG) provides information on the role of transport modelling and appraisal.

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

Documents

TAG unit M4 forecasting and uncertainty

PDF, 677 KB, 57 pages

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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 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.

Updates to this page

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

  1. TAG unit M4 updated.

  2. Added forthcoming change about appraisal guidance updates.

  3. TAG unit M4 updated.

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

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

  6. TAG unit M4 forecasting and uncertainty updated.

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

  8. First published.

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