  Cooperative Intelligent Transportation Systems (C-ITS) constitute
technologies which enable vehicles to communicate with each other and/ or with
the infrastructure. C-ITS include systems and services which use different
components, in order to share and exchange information via diverse
communication interfaces. Since various C-ITS deployment initiatives have taken
place during the last years all over the world, the necessity to identify a
framework, in order to ensure interoperability of C-ITS across borders is
currently in sight constituting a challenging task. Such an approach should
rely on the deployment of C-ITS services based on common architectures and
standards, pursuing harmonization and interoperability. The current paper aims
to present the work conducted in the context of a United States (US) - European
Commission (EC) collaboration on the development of harmonized and
interoperable C-ITS architectures.
