CODECS is a Coordination and Support Action for Cooperative Intelligent Transport Systems funded by the European Commission in the Horizon 2020 programme. Communication of vehicles directly amongst each other and with road infrastructure enables a plethora of information and warning services for a safe, sustainable and comfortable future mobility. These services require new cooperations not only between private and public sector in order to provide seamless experience for the end-user. The issues to be tackled jointly are of very different nature ranging from fundamental technical and organisational aspects to legal concerns. Therefore lively exchange between the new collaboration partners is essential. In order to support this and to foster C-ITS deployment in Europe CODECS was set up as a nodal point for the various involved stakeholder groups. The CODECS consortium, consisting of road operators, car manufacturers, automotive industry experts as well as user and cities representatives, aims at pooling the main actors’ preferences and requirements for a concerted C-ITS roll-out across Europe. The inventory phase was the starting point when the numerous pilots and deployment initiatives and private key stakeholders were brought together and the current plans, concepts and ideas were gathered. Numerous documents were analysed and several workshops organised. The experiences of this knowledge exchange and the constant survey of the C-ITS landscape in Europe were used in the consolidation phase to come up with guidelines and recommendations. This report summarises the CODECS activities.