Research and analysis

TAG: updated evidence for optimism bias uplifts

A report on the updated evidence for optimism bias uplifts for transport appraisals.

• From: Department for Transport
• Published: 19 May 2021

Documents

Updating the evidence behind the optimism bias uplifts for transport appraisals

PDF, 1.57 MB, 63 pages

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Details

This report provides updated evidence for optimism bias uplifts used in transport appraisals.

It includes:

• expanded data and analysis on optimism bias uplifts
• information on recent developments in reference class forecasting (RCF)

Oxford Global Projects completed the research on behalf of Department for Transport (DfT).

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 19 May 2021