Understanding how road operators can harness a paradigm shift in traffic management operations through increased vehicle connectivity, is a key objective of Ireland’s Cooperative Intelligent Transport Systems (C-ITS) pilot project. Transport Infrastructure Ireland (TII) and the European Commission are co-funding the C-ITS pilot deployment including integration into their traffic management system. This is one of the first C-Roads participating countries to integrate C-ITS as part of day-to-day traffic operations. This paper discusses the practical challenges and some of the key activities undertaken to implement and evaluate an effective and interoperable large-scale C-ITS pilot.