Guidance

TAG uncertainty scenarios: upcoming changes

Outlines upcoming changes to uncertainty scenario guidance.

From:
Department for Transport
Published
11 December 2025

Documents

Summary of upcoming changes to uncertainty scenario guidance

HTML

Details

Department for Transport (DfT) is refreshing its uncertainty scenario guidance. This document:

  • explains why we are making changes
  • outlines our aims
  • provides more information on the change process

Transport analysis guidance (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 11 December 2025

Sign up for emails or print this page