The CoEXist project aim is to strengthen the capabilities of urban road authorities for the planning and integration of connected and automated vehicles (CAVs) on their networks. It is the first European project focusing on the technological development of microscopic and macroscopic transport modelling tools, CAV-simulators and CAV control logics. The expected outputs of CoEXist are a CAV-ready transport modelling tool, an impact assessment tool, and an action plan and framework as guidance for road authorities. Furthermore, CoEXist will systematically increase the capacity of road authorities in Gothenburg, Stuttgart, Milton Keynes and Helmond by training them to use the developed tools to get ready for the transition towards a shared road network with increasing levels of CAVs, both in terms of vehicle penetration rates and levels of automation. To tackle the challenges of CAV deployment on urban road networks, the project is taking a holistic and trans-disciplinary approach by bringing together leading organisations and relevant stakeholders in the field.