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Ex-Post Assessment of Transport Investments and Policy Interventions

image of Ex-Post Assessment of Transport Investments and Policy Interventions

Ex-post evaluation is important to improving the delivery of transport policy objectives. It can be used for multiple purposes at the core of which is the improvement of ex-ante assessment. A small number of jurisdictions employ ex-post evaluation systematically and leading experience is reviewed in this report.

One reason ex-post analysis is not more widely employed is a number of methodological and data challenges. Several approaches have been developed to tackle these, including advanced statistical approaches, establishment of transport observatories to retain data that would otherwise be lost and a case study approach to compare similar locations subject to different investment and policy treatments.

This report examines examples of best practice, discussing the potential of different approaches and how they can be used to complement each other.

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Causal inference for ex-post evaluation of transport interventions

International Transport Forum

This chapter reviews methods that seek to draw causal inference from non-experimental data and shows how they can be applied to undertake ex-post evaluation of transport interventions. In particular, the chapter discusses the underlying principles of techniques for treatment effect estimation with non-randomly assigned treatments. The aim of these techniques is to quantify changes that have occurred due to explicit intervention (or "treatment").

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