It is well-defined given its scope as a taxonomical classification, rather than a technical specification. From the opening paragraph [0]: “This document does

It is well-defined given its scope as a taxonomical classification, rather than a technical specification. From the opening paragraph [0]: “This document does not provide specifications, or otherwise impose requirements on, driving automation systems (for further elaboration, see 8.1). [1]: “8.1 This document is not a specification and imposes no requirements. This document provides a logical taxonomy for classifying driving automation features (and ADS-equipped vehicles), along with a set of terms and definitions that support the taxonomy and otherwise standardize related concepts, terms and usage in order to facilitate clear communications. As such, it is a convention based upon reasoned agreement, rather than a technical specification.“ 0: https://saemobilus.sae.org/download/?fileFormat=pdf&cid=1000434983#page1 https://saemobilus.sae.org/download/?fileFormat=pdf&cid=1000... 1: https://saemobilus.sae.org/download/?fileFormat=pdf&cid=1000434983#page36 https://saemobilus.sae.org/download/?fileFormat=pdf&cid=1000...