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The TAG data book provides all of the appraisal and modelling values referred to in TAG guidance. The data book features historical information and factual reference information about the appraisal and modelling values.
The previous version, TAG Data Book v1.20.2, was released in January 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.
Published 29 November 2018 Last updated 6 October 2023 +show all updates
Added forthcoming change about carbon valuation.
TAG data book updated.
Added forthcoming change: spring 2023 data book and guidance updates.
