  Connected and Autonomous Vehicles (CAVs) will play a crucial role in
next-generation Cooperative Intelligent Transportation Systems (C-ITSs). Not
only is the information exchange fundamental to improve road safety and
efficiency, but it also paves the way to a wide spectrum of advanced ITS
applications enhancing efficiency, mobility and accessibility. Highly dynamic
network topologies and unpredictable wireless channel conditions entail
numerous design challenges and open questions. In this paper, we address the
beneficial interactions between CAVs and an ITS and propose a novel
architecture design paradigm. Our solution can accommodate multi-layer
applications over multiple Radio Access Technologies (RATs) and provide a smart
configuration interface for enhancing the performance of each RAT.
