Purpose: The purpose of this study is to analyse and assess the relationship between economic development and transport development in the European Union and Poland. Design/Methodology/Approach: The study was conducted using formalised methods and expert analyses, drawing on the relevant literature as well as the authors‘ theoretical and practical experience. The issue is addressed comprehensively, as analysing transport-related problems in isolation from the economy would be methodologically inadequate. Findings: The study is based on formalised methods, expert analyses, a literature review, and the authors’ theoretical and practical expertise. It examines and presents the relationship between the economy and transport development over a nearly 20-year period in the European Union and Poland, and assesses its validity. Practical implications: The study’s theoretical contribution lies in the development of a formalised research method, while its practical value consists in its applicability by EU and national authorities in the design of transport development strategies. Originality/value: This study offers a comprehensive and methodologically rigorous analysis of the research problem over a 19-year time horizon, applying formalised methods (including a six-degree polynomial and exponential function), structuring the empirical material and generating substantive conclusions.

Leszek Mindur Et Al (2026). A Formalised Method for Analysing the Relationship between the Economy and Transport: The Case of the European Union and Poland, European Research Studies Journal Volume XXIX Issue 2, 67-78