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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Summary of discussions

International Transport Forum

This summary of discussions begins by outlining the meaning of ex-post vs. ex-ante evaluation and examining the accuracy of the conventional ex-ante methodology. It then describes two basic systems/approaches to data collection and evaluation. Next it presents the challenges in expanding the conventional investment appraisal to broader development effects and the statistical tools available to evaluate the broader development effects in ex-post evaluation. Lastly, the need to expand the concept of ex-post evaluation to monitoring is discussed and concluding remarks are given.

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