Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of ISO document should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

ISO draws attention to the possibility that the implementation of this document may involve the use of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s) which may be required to implement this document. However, implementers are cautioned that this may not represent the latest information, which may be obtained from the patent database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.

Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 204, Intelligent transport systems.

This first edition cancels and the first edition of ISO/TS 23792-1:2023 , which has been technically revised.

The main changes are as follows:

addition of Type 2 systems (5.4) and requirements associated with Type 2 systems;
addition of requirements associated with misuse countermeasures (6.5);
addition of Type 2 system description and design considerations (Annex A).

A list of all parts in the ISO 23792 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

Introduction

An automated driving system (ADS) needs to be designed with the capability to cope with various conditions, such as the driving environment, behaviour of other vehicles in the surroundings, traffic regulations, etc.

In addition, an ADS designed to operate on motorways can encounter various situations such as merging into the main lane of traffic, adjusting the speed according to congested or freely flowing traffic, overtaking other vehicles, or changing lanes when approaching an exit or lane closure.

For Level 3 automated driving, the ADS issues a request to the fallback-ready user (FRU) to take over driving tasks when it cannot respond to certain conditions or situations.

The ISO 23792 series identifies the performance requirements for an ADS based on its capability to respond to certain conditions and situations. The requirements are derived in order to reliably transfer the control between the human driver and ADS, and for safe operation by the ADS.

The ISO 23792 series focuses on the system functionalities, under the assumption that the FRU is available and responsive to system requests to take over driving tasks.

1 Scope

Motorway chauffeur systems (MCS) perform Level 3 automated driving on limited access motorways with the presence of a fallback-ready user (FRU).

This document describes a framework of MCS including system characteristics, system states and transition conditions and system functions.

This document specifies requirements for the basic set of functionalities of a MCS, and test procedures to verify these requirements.

The requirements include vehicle operation to perform the entire dynamic driving task (DDT) within the current lane of travel, to issue a request to intervene (RTI) before disengaging, and to extend operation and temporarily continue to perform the DDT after issuing an RTI.

Requirements and test procedures for additional functionalities (such as lane changing) are provided in other parts of the ISO 23792 series .

Means related to setting a destination and selecting a route to reach the destination are not within the scope of this document. This document applies to MCS installed in light vehicles^[ 9 ^].

2 Normative references

3 Terms and definitions

4 Abbreviated terms

5 Characteristics of motorway chauffeur systems (MCS)

5.1 General

5.2 Operational design domain (ODD)

5.3 System functionalities

5.4 Classification

5.5 System limitations

5.6 Providing information to the user

6 General system requirements

6.1 Operating conditions

6.2 State transition

6.3 System functions

6.4 Requirements for continuing operation after detecting disengagement-triggering conditions

6.5 Misuse countermeasures

7 Minimum performance requirements of the dynamic driving task (DDT)

7.1 General

7.2 Following traffic rules

7.3 Operating speed range

7.4 Normal operation

7.5 Performance-impaired operation

7.6 Reaction to unresponsive fallback ready user (FRU)

8 Test procedures

8.1 General

8.2 Scenario 1: Reaction to unresponsive fallback-ready user

8.3 Scenario 2: Direct disengagement by steering input

8.4 Scenario 3: Continued operation after brake input

8.5 Scenario 4: Forward vehicle braking hard

8.6 Scenario 5: Aggressive cut-in from the adjacent lane

8.7 Scenario 6: Obstacle in lane

8.8 Scenario 8: Approaching geographical operational design domain (ODD) boundary

8.9 Scenario 9: Engagement restricted outside ODD

Bibliography