The main objective of the Action was to establish a concept integrating at regional scale all the environmental aspects of traffic and land-transport infrastructure in relation to the decision-making process – in order to assist policy-makers at an earlier stage of their decision-making process. The final report developed an operational methodology and key aspects in support of Strategic Environmental Assessment (SEA). The main elements are: * Transport infrastructure planning situations and planning options. * Impact and indicator structure. * Impact assessment and impact aggregation methods. * Transport planning option parameters and assessment methods including monitoring. The results and recommendations were related to four geographical levels (national, regional, local and corridor level). Based on these levels, an evaluation was made on Sea compliance of case studies with the EU-directive and a synthesis of present approaches and lessons learned. Furthermore, the Action explores the themes of impact scoring (significance) and aggregation in the context of integrated assessment. A review of relevant guidance documents and methods was carried out and examples of best practice were explored. The Action brought together existing available guidance on “impact significance” across the member states participating in this COST initiative.
