Context: Connected and automated vehicles are a key focal point of ITS research. To enable and accelerate their deployment in our everyday life, ICT is a prerequisite; this is the frame in which ICT4CART project places itself. Despite the significant advances in the telecom and IT industries, several ICT challenges related to connectivity, data management, cyber-security and ICT infrastructure architectures still exist, and need to be addressed to enable road vehicle automation. ICT4CART aims to address the gaps to deployment, bringing together key players from the automotive, telecom and IT industries, to shape the ICT landscape for Connected and Automated Road Transport and to boost EU competitiveness and innovation in this area. Project scope: ICT4CART’s main objective is to design, implement and test in real-life conditions a versatile ICT infrastructure that will enable the transition towards higher levels of automation (up to L4), addressing existing gaps and working with specific key ICT elements, namely hybrid connectivity, data management, cyber-security, data privacy and accurate localisation. ICT4CART builds on high-value use cases (urban and highway), which will be demonstrated and validated in real-life conditions at ICT4CART test sites in Austria, Germany and Italy. Significant effort will be put on cross-border interoperability, setting up a separate test site at the Italian-Austrian border. D9.3 Definition of Communication Strategy & Plan (Version III): This document provides ICT4CART’s final communication strategy and plan. It includes a detailed overview on all communication and dissemination actions that have been performed by the ICT4CART consortium from M1 until M36. As granted via the official extension obtained by the project, the publication of D9.3 Definition of Communication Strategy and Plan (Version III) has been postponed from M30 to M36. This has allowed the consortium to re-adapt the strategy and the plan including ad hoc mitigation actions to overcome the difficulties imposed by the COVID-19 global pandemic. Moreover, since ICT4CART’s original structure foresaw the release of D9.3 six (6) months prior to the end of the project, the release at M36 reflects this original structure. D9.3 Definition of Communication Strategy and Plan (Version III) summarises the approach that has been used by ICT4CART partners to achieve an effective and efficient communication and dissemination of project news, outcomes and results. Moreover, it highlights key communication 7 objectives and target audiences that have driven the consortium’s communications efforts. Communication and dissemination activities involve all consortium partners and constitute an essential part of the project development and implementation. To ensure ICT4CART high visibility, outreach and impact on all involved/interested actors, communication and disseminations activities have been carried out as a joint effort by the consortium.