Within a few years autonomous vehicles will drive round without human intervention, using their built in sensors and AI / machine learning to control the vehicle movement. How might communications between vehicles lead to an improvement in their autonomous operation? How will communications be used to support drivers before we have full autonomy in the vehicles? Consideration of the use cases will lead to clarification of the requirements for vehicle to vehicle communications. Considerations of universal coverage, latency, data volumes and safety criticality will be a major input to the choice of the most suitable communications systems. Commercial and political factors also need to be taken into consideration. Nigel will introduce some of the main use-cases. He will also identify some of the most important communication technology options and indicate where there is clarity on the most suitable v2x technology choice and where there is still not an agreement on the best system to use.