Revealing EIA process-related barriers in transport projects: The cases of Italy, Portugal, and Spain

The effectiveness of Environmental Impact Assessment (EIA) in the transport field is increasingly being contested. Apart from technical issues (e.g., impacts measurements), the literature highlights process-related barriers as key obstacles to effective EIA implementation in transport projects (e.g., lack of collaborative work, transparency, etc.). Nevertheless, most academic efforts to date have focused on technical improvements, paying limited attention to the relevance of process-related barriers. To address this shortcoming, the paper aims to explore and compare how EIA is experienced and perceived by professionals in three South-European countries (Italy, Portugal, and Spain), providing additional insights into EIA process-related barriers in transport projects. The findings were obtained through an online survey of 294 professionals, representing two main stakeholder groups: environmental consultants and transport planners. The results reveal four main types of process problems shared in all three countries: (i) EIA timing, (ii) assessment of alternatives, (iii) monitoring system, and (iv) public participation. The highest divergences are seen in Spain, where 42% of identified process-related barriers are shared with the rest of countries, while Italian and Portuguese respondents agree in the perception of 68% of process-related barriers. The main differences between the barriers identified by transport planners and environmental consultants are related to their assessment of the need for more collaborative work between key actors. It is finally discussed the added value of this research to progress towards the homogenization of EIA processes across countries.Peer reviewe