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The terms and definitions in this document describe the functions performed within an ADS, as defined in SAE J3016. Where possible we have attempted to capture the language that is already in use within the automated driving development community. Where needed, we have added new terms and definitions, including clarifying notes to avoid ambiguity. SAE J3131 deals primarily with Level 4 and Level 5 ADS features.

This document provides a high-level ontology and lexicon for describing on-road ADS-operated vehicle behavioral competencies and driving maneuvers that comprise routine/normal performance of the complete DDT, as defined in SAE J3016. It provides definitions of behavior, maneuver, scenario, and scene. This initial high-level lexicon and ontology are developed for ADS driving behaviors, including considerations for hierarchy of behaviors, and relationships among maneuvers, operational design domain (ODD) elements, and object and event detection and response (OEDR). Considerations for describing scenarios using this lexicon and ontology are discussed. This document describes ADS-operated vehicle motion control maneuvers during routine/normal operation. Maneuvers of other road users are not evaluated. This document assumes left-hand drive vehicles and road infrastructure.

This document describes [motor] vehicle driving automation systems that perform part or all of the dynamic driving task (DDT) on a sustained basis. It provides a taxonomy with detailed definitions for six levels of driving automation, ranging from no driving automation (Level 0) to full driving automation (Level 5), in the context of [motor] vehicles (hereafter also referred to as “vehicle” or “vehicles”) and their operation on roadways: Level 0: No Driving Automation Level 1: Driver Assistance Level 2: Partial Driving Automation Level 3: Conditional Driving Automation Level 4: High Driving Automation Level 5: Full Driving Automation These level definitions, along with additional supporting terms and definitions provided herein, can be used to describe the full range of driving automation features equipped on [motor] vehicles in a functionally consistent and coherent manner.