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Technical
Report
ISO/TR 21734-3
First edition
Intelligent transport systems —
2024-06
Performance testing for
connectivity and safety functions of
automated driving buses in public
transport —
Part 3:
Service framework and use cases
Systèmes de transport intelligents — Essais de performance pour
les fonctions de connectivité et de sécurité des bus à conduite
automatisée dans les transports publics —
Partie 3: Cadre de service et cas d'usage
Reference number
© ISO 2024
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Terms and definitions .1
3.2 Abbreviated terms and symbols.3
4 ADB service framework . 3
4.1 ADB service components .3
4.1.1 General .3
4.1.2 Automated driving bus (ADB) .4
4.1.3 Monitoring and control centre .4
4.1.4 IoT infrastructure.5
4.1.5 Smart bus station .5
4.1.6 ADB passenger.5
4.1.7 Summary .5
4.2 Fare management system .6
4.3 Identification .6
4.4 Security .7
4.4.1 General .7
4.4.2 Public interest .7
4.4.3 Assets to protect .7
4.4.4 General criteria for security .7
5 ADB service and use cases . 8
5.1 Overview .8
5.2 ADB operation service .8
5.2.1 General .8
5.2.2 Use case 1-1: Predefined route type .9
5.2.3 Use case 1-2: on-demand type .11
5.3 Passenger payment handling service . 13
5.3.1 General . 13
5.3.2 Use case 2-1: Prepaid fare system . 15
5.3.3 Use case 2-2: Deferred payment system . .16
5.4 ADB emergency response service .18
5.4.1 General .18
5.4.2 Use case 3-1: Occurrences of accidents and autonomous driving system errors .18
5.4.3 Use case 3-2: Occurrences of in-vehicle emergencies .19
5.5 Transport information provision service . 20
5.5.1 General . 20
5.5.2 Use case 4: Transport information provision service for safe operation of ADBs .21
Annex A (informative) ADB system activities (field test) in the Republic of Korea .24
Bibliography .26
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,
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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).
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rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
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This document was prepared by Technical Committee ISO/TC 204, Intelligent transport systems.
A list of all parts in the ISO 21734 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.
iv
Introduction
Automated vehicle technology has been developing rapidly in recent years as one of the measures for reducing
automobile accidents caused by human errors and for promoting the automobile industry. The automated
driving bus (ADB) is a new type of public transport mode embedded with automated vehicle technologies.
The progress of development and deployment of ADBs has accelerated in recent years, exceeding that of
automated passenger vehicles.
From the connectivity perspective, to ensure its effectiveness as a public transport mode, ADBs need to
connect with:
— traffic signal networks both for vehicles and pedestrians;
— the monitoring and control centre for bus operation; and
— other relevant infrastructure.
In terms of safety, the ADB needs to:
— be embedded with automated vehicle functions to connect with the wireless signal control system; and
— be ready to respond to unexpected situations involving other road users such as pedestrians and
bicyclists.
With secured connectivity and safety, ADBs can provide stable services.
Along with stable service provision, an ADB deviates its operational measures from conventional ones.
This document describes basic components for providing transport services and service framework based
on ADB. It also explains use-cases of ADB services, including structure of service components, operational
route management, fare payment, emergency response, and provision of operational information along with
service procedures for each service use-case.
Furthermore, public transport authorities need technical reference points to measure the service
performance of ADB for enhancing public safety on roads.
This document provides the basis for the development of performance testing for connectivity and safety
functions of ADB on a national and international level. It is intended to benefit public transport operators,
relevant governing authorities and industrial stakeholders.
v
Technical Report ISO/TR 21734-3:2024(en)
Intelligent transport systems — Performance testing for
connectivity and safety functions of automated driving buses
in public transport —
Part 3:
Service framework and use cases
1 Scope
This document specifies the general service framework and components for operating automated driving
buses (ADBs) in public transport networks. It includes:
a) a description of the ADB service components which consist of ADBs, the monitoring and control (MC)
centre, Internet of Things (IoT) infrastructure, the smart bus stations and the passengers.
b) a description
...