ISO/TR 19560:2025

Technical
Report
ISO/TR 19560
First edition
Intelligent transport systems —
2025-02
Information interface framework
between automated driving systems
and users
Systèmes de transport intelligents — Cadre d'interface
d'information entre les systèmes de conduite automatisée et les
utilisateurs
Reference number
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 1
5 System image . 1
6 Classification of the information in ADS. 2
6.1 General strategy for information classification .2
6.2 Fallback cases .2
6.3 Direction of the information .4
6.4 Criticality assessment .5
6.4.1 General .5
6.4.2 Information from ADS to user (A) .5
6.4.3 Information from user to ADS (B) .6
6.5 Classification of information .8
6.6 Priority of information transmission .9
Bibliography .10

iii
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.
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.

iv
Introduction
Automated driving systems (ADS), which are expected to become increasingly popular in the future, can
need to convey situation-specific information to or from users.
For example, when it becomes necessary to lower the level of driving automation or cancel it for a given
reason, it is important to notify the user of this change and to prompt the user to monitor the surroundings
or take a certain action. Additionally, when the system executes a certain function, it can be necessary for
the user to confirm the intention.
ADS can receive supplementary information from users through nomadic devices (if these are paired to the
ADS) in addition to onboard devices. As users of ADS level 3 or higher are allowed to use certain nomadic devices
(such as smartphones) to perform secondary tasks while in the driver seat, a problem can potentially arise
where the ADS needs to inform the user of a critical message through a nomadic device currently being used.
Examples of information exchanged between the ADS and the user include:
— ADS prompting action by the user;
— ADS informing the user about the need for action in the near future;
— ADS informing the user about a change in operational status;
— user's nomadic device informing ADS about the user's current condition.
NOTE 1 The user is primarily the person sitting in the driver's seat, but also includes the passengers in a driverless
vehicle.
This document provides a review of ideas and policies on this subject that have gained international
consensus. Information to be provided to the user is stratified and aspects such as priority and content are
described. Within each classification, this document defines information attributes.
A primary classification of notifications to users is based on two broad criteria, which lead to differences in
the type of information provided to users:
a) degree of safety criticality: the user needs to take action or provide a response, the user needs to be
aware of a change, or user information is provided only for comfort or convenience;
b) time criticality.
ISO/SAE PAS 22736 discusses relevant terminology definitions as well as important concepts concerning
ADS design.
NOTE 2 Several documents have been published concerning an ergonomic approach to transport information and
control systems. See References [2], [3], [4] and [5].

v
Technical Report ISO/TR 19560:2025(en)
Intelligent transport systems — Information interface
framework between automated driving systems and users
1 Scope
This document describes the classification of notifications provided to and from users and automated
driving systems (ADS) of level 3 or higher.
This document does not include recommendations on how to provide information.
This document also includes information on transmission between nomadic devices and ADS in the context
where the user is concentrating on a device such as a smartphone, and the smartphone is able to monitor the
user’s condition.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Abbreviated terms
ADS automated driving system
DDT dynamic driving task
ODD operational design domain
FRU fallback ready user
MRM minimal risk manoeuvre
MRC minimal risk condition
5 System image
While the ADS system is used at automated level 3 or higher, the system asks the driver to take the wheel
or perform some action, such as when the sys
...