Infrastructure policy and climate policy interfere. Developing or upgrading transport infrastructure can have significant impacts on the decarbonisation of transport. While some types of infrastructure carry the risk to get locked-in to carbon intensive technology or transport modes, other projects may actually contribute to greenhouse gas reduction. Until now, the impacts on greenhouse gas emissions are not well integrated in transport infrastructure project appraisal. In order to achieve this interlinking of policy objectives and to feed the European Commission with further developing this issue, the European Foundation for Transport & Environment (T&E), together with partners asked CE Delft to develop a methodology for climate rating, which is presented in this report. Although the study primarily focuses on TEN-T, recommendations could also be applied to other EU funds which can, directly or indirectly, influence the decarbonisation of the European transport sector.