Major investments in transport infrastructure, such as the Trans-European Transport Network (TEN-T), place a high demand on public resources. The responsible authorities are placing increasing emphasis on evaluating not only the costs and benefits from a transport perspective (such as savings in travel time) but also the wider socio-economic impact of the projects such as production and employment. Moreover, for the TEN-T there is a requirement to assess effects at a network level, looking at how the entire investment programme could influence the environment and regional development. Therefore, decision-makers need tools for estimating these wider socio-economic and spatial impacts.