Transport infrastructures, provided they are correctly planned, have a positive impact on a region’s economic growth. In recent decades, supported by this belief, investment in transport projects has been given priority on the policy agendas of many governments. However, despite the high volume of resources allocated to the construction and maintenance of infrastructure (developed countries typically allocate between 3 and 5% of their GDP to transport infrastructure), sufficient attention is not always paid to the principles that should guide their financing.