  The aim of this paper is to investigate the relationship between operational
design domains (ODD), automated driving SAE Levels, and Technology Readiness
Level (TRL). The first highly automated vehicles, like robotaxis, are in
commercial use, and the first vehicles with highway pilot systems have been
delivered to private customers. It has emerged as a crucial issue that these
automated driving systems differ significantly in their ODD and in their
technical maturity. Consequently, any approach to compare these systems is
difficult and requires a deep dive into defined ODDs, specifications, and
technologies used. Therefore, this paper challenges current state-of-the-art
taxonomies and develops a new and integrated taxonomy that can structure
automated vehicle systems more efficiently. We use the well-known SAE Levels
0-5 as the "level of responsibility", and link and describe the ODD at an
intermediate level of abstraction. Finally, a new maturity model is explicitly
proposed to improve the comparability of automated vehicles and driving
functions. This method is then used to analyze today's existing automated
vehicle applications, which are structured into the new taxonomy and rated by
the new maturity levels. Our results indicate that this new taxonomy and
maturity level model will help to differentiate automated vehicle systems in
discussions more clearly and to discover white fields more systematically and
upfront, e.g. for research but also for regulatory purposes.
