  Information and communication technology (ICT) is an enabler for establishing
automated vehicles (AVs) in today's traffic systems. By providing complementary
and/or redundant information via radio communication to the AV's perception by
on-board sensors, higher levels of automated driving become more comfortable,
safer, or even possible without interaction by the driver, especially in
complex scenarios. Additionally, communication between vehicles and/or a
central service can improve the efficiency of traffic flow. This paper presents
a reference architecture for such an infrastructure-based support of AVs. The
architecture combines innovative concepts and technologies from different
technological fields like communication, IT environment and data flows, and
cyber-security and privacy. Being the basis for the EU-funded project ICT4CART,
exemplary implementations of this architecture will show its power for a
variety of use cases on highways and in urban areas in test sites in Austria,
Germany, and Italy, including cross-border interoperability.
