DfT updates three WebTAG units


The Department for Transport (DfT) has published three updated sections of its WebTAG transport analysis guidance.

The updated sections are: TAG unit M2 variable demand modelling; the TAG data book; and TAG unit A1-3 user and provider impacts.

WebTAG 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.

The DfT has published 3 updated sections of WebTAG

TAG unit M2 variable demand modelling replaces a version published in January 2014.

The TAG data book includes all of the appraisal and modelling values referred to in the guidance in 1 workbook and replaces the July 2016 version. Changes made to the data book are detailed in its audit sheet.

In May, the data book will be updated further with revised fuel consumption parameters and projected changes in fuel efficiency, to reflect empirical evidence of the growing gap between ‘real-world’ and test-cycle road vehicle fuel efficiency.

TAG unit A1-3 user and provider impacts replaces a version published in November 2014.

The DfT said it endeavours to keep the guidance up to date in light of new evidence and developments in best practice modelling and appraisal methodologies.

Changes are released through an orderly release process, giving users early sight of changes and when they are to be released definitively.

Users working on longer-term business cases should refer to the proportionate update process when considering incorporating these changes into their analyses.


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