prEN ISO 19321

• Abstract:

  This document specifies the in-vehicle information (IVI) data structures that are required by different intelligent transport system (ITS) services for exchanging information between ITS stations (ITS-S). A general, extensible data structure is specified, which is split into structures called containers to accommodate current-day information. Transmitted information includes IVI such as contextual speed, road works warnings, vehicle restrictions, lane restrictions, road hazard warnings, location-based services and re-routing. The information in the containers is organized in sub-structures called data frames and data elements, which are described in terms of their content and syntax.; The data structures are specified as communications-agnostic. This document does not provide the communication protocols. This document provides scenarios for usage of the data structure, e.g. in case of real time, short-range communications.

• Status: Not Published
• Publication Date: 08-Feb-2028
• ICS: 43.040.15 - Car informatics. On board computer systems
• Technical Committee: CEN/TC 278 - Road transport and traffic telematics
• Drafting Committee: CEN/TC 278/WG 16 - Co-operative systems
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 16-Jul-2026
• Completion Date: 16-Jul-2026
• Ref Project: oSIST prEN ISO 19321:2026 - Intelligent transport systems - Cooperative ITS - Dictionary of in-vehicle information (IVI) data structures (ISO/DIS 19321:2026)

• Revises: CEN ISO/TS 19321:2024 - Intelligent transport systems - Cooperative ITS - Dictionary of in-vehicle information (IVI) data structures (ISO/TS 19321:2024)
• Effective Date: 11-Jun-2025

Overview

prEN ISO 19321:2026, Intelligent transport systems – Cooperative ITS – Dictionary of in-vehicle information (IVI) data structures is a key draft international standard managed jointly by ISO and CEN under ISO/TC 204 and CEN/TC 278. This document defines the data structures necessary for the exchange of in-vehicle information (IVI) between intelligent transport system stations (ITS-S) within cooperative ITS (C-ITS) environments. Its focus is on establishing a general, extensible and communications-agnostic framework using containers, data frames, and data elements to consistently represent IVI for a wide variety of ITS applications and services.

The standard is applicable to a broad range of IVI scenarios, supporting information types such as contextual speed advisories, road works warnings, vehicle and lane restrictions, road hazard notifications, location-based services and re-routing. By harmonizing how in-vehicle data is structured and transmitted, prEN ISO 19321 helps ensure safe, efficient and reliable delivery and use of IVI across different ITS platforms and implementations.

Key Topics

• Structured Data Model

  • Defines the IVI data structure composed of containers, data frames, and data elements.
  • Segregates current and future information needs using a modular approach.
  • Data elements capture individual data points, while data frames provide structured groupings.

• Container-Based Architecture

  • Uses mandatory and optional containers, such as Management, Location, Application, Text, Layout, and Automated Vehicle Containers.
  • Management containers support identification and control of the entire IVI dataset.
  • Location containers provide geographic or map-based references to accurately associate IVI with road segments or zones.

• Communications-Agnostic

  • Specifies only the data structure, independent of underlying communication protocols.
  • Supports integration with diverse ITS messaging standards such as CAM, DENM, or BSM.

• Extensibility for Future Needs

  • Designed to add new containers or adapt to new data requirements without disrupting legacy systems.

Applications

prEN ISO 19321:2026 enables a wide range of practical, cross-vendor intelligent transport system applications, such as:

• Road Safety Enhancements

  • Real-time delivery of road hazard warnings, temporary speed limits, and work zone advisories directly to in-vehicle systems.

• Traffic Efficiency and Management

  • Supports dynamic re-routing with up-to-date restrictions or lane usage notifications.
  • Facilitates coordination between roadside equipment and vehicles, improving the flow of information needed for efficient traffic control.

• Support for Automated and Connected Vehicles

  • Provides a standardized format for transmitting actionable IVI, crucial for advanced driver assistance systems (ADAS) and automated driving functions.
  • Ensures that both legacy and future vehicle platforms can interpret and apply critical environment and regulatory data.

• Localization and Zone-Based Services

  • Allows vehicles to process location-based messages with precision, using either geographic coordinates or digital map references.

• Interoperability among Stakeholders

  • Promotes compatibility between equipment manufacturers, road operators, service providers, and public authorities by using a unified IVI data dictionary.

Related Standards

To ensure comprehensive and interoperable ITS deployments, prEN ISO 19321:2026 references and complements several important international standards:

• ISO 14823-1 – Intelligent transport systems – Graphic data dictionary – Part 1: Specification
  Provides standard codes for road signs and traffic messages used in IVI.

• ISO 17573-3 – Electronic fee collection – System architecture for vehicle-related tolling – Part 3: Data dictionary
  Contributes foundational data models for vehicle and road-related data.

• ETSI TS 102 894-2 – Intelligent Transport Systems (ITS); Users and applications requirements; Part 2: Applications and facilities layer common data dictionary
  Addresses common data models for ITS communication layers and extends IVI use scenarios.

• SAE J2540/2 – International Traveler Information Systems (ITIS) Phrase Lists
  Provides standardized phrases for traveler and vehicle information relevant to IVI content.

Practical Value

By adopting prEN ISO 19321:2026, ITS stakeholders gain an efficient, interoperable framework for structuring, managing, and exchanging in-vehicle information. This drives safer roads, smarter vehicles, and a more connected transport ecosystem-while future-proofing ITS deployments against evolving mobility technologies and regulatory needs.

SLOVENSKI STANDARD
01-september-2026
Inteligentni transportni sistemi - Kooperativni sistem (ITS) - Podatkovni slovar
informacijskih struktur v vozilih (ISO/DIS 19321:2026)
Intelligent transport systems - Cooperative ITS - Dictionary of in-vehicle information (IVI)
data structures (ISO/DIS 19321:2026)
Intelligente Transportsysteme - Kooperative ITS - Verzeichnis von Datenstrukturen
fahrzeuginterner Informationen (IVI) (ISO/DIS 19321:2026)
Systèmes intelligents de transport - Coopérative STI - Dictionnaire de structures de
données d'informations dans les véhicules (IVI) (ISO/DIS 19321:2026)
Ta slovenski standard je istoveten z: prEN ISO 19321
ICS:
35.240.60 Uporabniške rešitve IT v IT applications in transport
prometu
43.040.15 Avtomobilska informatika. Car informatics. On board
Vgrajeni računalniški sistemi computer systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 19321
ISO/TC 204
Intelligent transport systems —
Secretariat: ANSI
Cooperative ITS — Dictionary of
Voting begins on:
in-vehicle information (IVI) data
2026-07-16
structures
Voting terminates on:
2026-10-08
Systèmes intelligents de transport — Coopérative STI —
Dictionnaire de structures de données d'informations dans les
véhicules (IVI)
ICS: 35.240.60
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
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USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
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NOTIFICATION OF ANY RELEVANT PATENT
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PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 19321:2026(en)
DRAFT
ISO/DIS 19321:2026(en)
International
Standard
ISO/DIS 19321
ISO/TC 204
Intelligent transport systems —
Secretariat: ANSI
Cooperative ITS — Dictionary of
Voting begins on:
in-vehicle information (IVI) data
structures
Voting terminates on:
Systèmes intelligents de transport — Coopérative STI —
Dictionnaire de structures de données d'informations dans les
véhicules (IVI)
ICS: 35.240.60
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
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BE CONSIDERED IN THE LIGHT OF THEIR
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NATIONAL REGULATIONS.
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RECIPIENTS OF THIS DRAFT ARE INVITED
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TO SUBMIT, WITH THEIR COMMENTS,
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NOTIFICATION OF ANY RELEVANT PATENT
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Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 19321:2026(en)
ii
ISO/DIS 19321:2026(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 3
5 In-vehicle information data structure . 4
5.1 Structural model .4
5.1.1 General model .4
5.1.2 Conceptual zones .5
5.2 Location referencing .7
5.2.1 General .7
5.2.2 Geographic location referencing .7
5.2.3 Map-based location referencing .8
6 IVI Containers . 8
6.1 Management Container .8
6.1.1 Definition .8
6.1.2 Usage — Management Container .9
6.2 Location Containers .10
6.2.1 General .10
6.2.2 Geographic Location Container.10
6.2.3 Map Location Container . 12
6.3 Application Containers . 13
6.3.1 General . 13
6.3.2 General IVI Container . 13
6.3.3 Road Configuration Container .16
6.3.4 Text Container .17
6.3.5 Layout Container .19
6.3.6 Automated Vehicle Container . 20
6.3.7 Infrastructure Support Container .21
7 Description of data frames and data elements .22
7.1 General . 22
7.2 Data frames . 22
7.2.1 AbsolutePosition . 22
7.2.2 AbsolutePositionWAltitude . 22
7.2.3 AnyCatalogue . 22
7.2.4 AutomatedVehicleRule . 23
7.2.5 CompleteVehicleCharacteristics .24
7.2.6 ComputedSegment .24
7.2.7 DeltaPosition . . .24
7.2.8 InfrastructureSupportInformation .24
7.2.9 ISO14823Attribute . . 25
7.2.10 ISO14823Code . 25
7.2.11 LaneInformation . 25
7.2.12 LaneCharacteristics . 26
7.2.13 LayoutComponent . 26
7.2.14 LegislationIdentifier . 26
7.2.15 LoadType .27
7.2.16 MapReference .27
7.2.17 PlatooningRule .27
7.2.18 PolygonalLine . 28
7.2.19 RoadSurfaceDynamicCharacteristics . 28

iii
ISO/DIS 19321:2026(en)
7.2.20 RoadSurfaceStaticCharacteristics . 28
7.2.21 RSCode . . 29
7.2.22 Segment . 29
7.2.23 SegmentExtended . 29
7.2.24 SupportItem . 30
7.2.25 Text . 30
7.2.26 TractorCharacteristics . 30
7.2.27 TrailerCharacteristics.31
7.2.28 TrainCharacteristics .31
7.2.29 VcCode.31
7.2.30 VehicleCharacteristicsFixValues .31
7.2.31 VehicleCharacteristicsRanges .32
7.2.32 Zone .32
7.2.33 Data frames which are lists .32
7.3 Data Elements . . 34
7.3.1 BankingAngle . 34
7.3.2 ComparisonOperator . 34
7.3.3 Condition . 34
7.3.4 DefinitionAccuracy . 34
7.3.5 Depth . . 35
7.3.6 Direction . 35
7.3.7 DriverCharacteristics . 35
7.3.8 FrictionCoefficient . 35
7.3.9 GapBetweenVehicles . 35
7.3.10 GoodsType . 35
7.3.11 IviIdentificationNumber . . 36
7.3.12 IviLaneWidth . 36
7.3.13 IviPurpose . 36
7.3.14 IviStatus . 36
7.3.15 IviType .37
7.3.16 LaneDelimitation .37
7.3.17 LaneId .37
7.3.18 LaneMarkingStatus . 38
7.3.19 LaneStatus . 38
7.3.20 LaneType . . . 38
7.3.21 MarkingColour . 38
7.3.22 MaterialType . 38
7.3.23 MaxLenghtOfPlatoon . 39
7.3.24 MaxNoOfVehicles . 39
7.3.25 PriorityLevel . 39
7.3.26 Provider . 39
7.3.27 RSCUnit . 39
7.3.28 SaeAutomationLevel . 40
7.3.29 Temperature . 40
7.3.30 TreatmentType . . . 40
7.3.31 VcClass . 40
7.3.32 VcOption . 40
7.3.33 WearLevel .41
7.3.34 Zid .41
Annex A (normative) ASN.1 modules .42
Annex B (informative) Visual examples of Location Container .43
Bibliography .50

iv
ISO/DIS 19321:2026(en)
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, in
collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 278,
Intelligent transport systems, in accordance with the Agreement on technical cooperation between ISO and
CEN (Vienna Agreement).
This first edition cancels and replaces the third edition of the previous Technical Specification
(ISO/TS 19321:2024), which has been technically revised.
The main changes are as follows:
— additions to the Geographic Location Container;
— additions to the General IVI container;
— deletion of the Road Surface Container.
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.

v
ISO/DIS 19321:2026(en)
Introduction
In a cooperative intelligent transport system (C-ITS), presenting information related to the traffic situation
or regulation of a road to the driver of a vehicle is an important component of road operations. The road
operators are responsible for road setup, operation, signage and maintenance for traffic management and
road safety, and in some countries, also for the enforcement of road laws. For road operators, efficient
transport of vehicles on roadways ensures a safe and predictable trip for all road users. Road operators,
together with equipment manufacturers, whether of vehicles or of roadside equipment, contribute to how
road information is properly presented to drivers.
So far, one defined C-ITS method for notifying road users of road and/or traffic situations and events is
by transmission of messages such as Cooperative Awareness Messages (CAM), Decentralized Environment
Notification Messages (DENM) or Basic Safety Messages (BSM).
This document supports mandatory and advisory road signage such as contextual speeds and road works
warnings. In-vehicle information can be sent by an ITS station (ITS-S) and either corresponds to physical
road signs such as static or variable road signs or does not correspond to physical road signs (a virtual sign),
or corresponds to road works. In-vehicle information (IVI) does not include identification of road events as
already provided by DENM.
This document provides a toolbox of information elements for IVI. It can be used for fulfilling the
requirements of the service provider considering the needs of the receiving ITS-S. The container concept
provides a way for an ITS-S to manage the relevant IVI information, determine where the IVI is relevant,
and to provide details for the application of the IVI. The description of data elements encompasses the data
syntax and semantics, i.e. a definition of data format and content, together with a description of how to use
those data elements.
This document is of an enabling nature. It does not specify which information is necessary for a certain
service, but it supports those IVI information elements that it can be necessary to transmit to a receiving
ITS-S to carry out a certain service. Usage of the IVI information elements depends on the specific context
and application of IVI for a specific service. Usage is established as mandatory or optional only for messaging
purposes, not for application purposes. In order to fulfil the requirements of a specific service, the IVI
structure can be appropriately profiled.
This document refers to ISO 14823-1 as one system of standardized codes for existing road signs codes.
NOTE ISO 14823-1 does not contain codes for specific national or regional signs that are not commonly used, and
it does not represent a catalogue of road sign pictograms for all applicable nations.

vi
DRAFT International Standard ISO/DIS 19321:2026(en)
Intelligent transport systems — Cooperative ITS — Dictionary
of in-vehicle information (IVI) data structures
1 Scope
This document specifies the in-vehicle information (IVI) data structures that are required by different
intelligent transport system (ITS) services for exchanging information between ITS stations (ITS-S).
A general, extensible data structure is specified, which is split into structures called containers to
accommodate current-day information. Transmitted information includes IVI such as contextual speed,
road works warnings, vehicle restrictions, lane restrictions, road hazard warnings, location-based services
and re-routing. The information in the containers is organized in sub-structures called data frames and data
elements, which are described in terms of their content and syntax.
The data structures are specified as communications-agnostic. This document does not provide the
communication protocols. This document provides scenarios for usage of the data structure, e.g. in case of
real time, short-range communications.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 639:2023, Code for individual languages and language groups
ISO 14823-1, Intelligent transport systems — Graphic data dictionary — Part 1: Specification
ISO 17573-3, Electronic fee collection — System architecture for vehicle-related tolling — Part 3: Data dictionary
ETSI/TS 102 894-2, Intelligent Transport Systems (ITS); Users and applications requirements; Part 2:
Applications and facilities layer common data dictionary; Release 2
SAE J2540/2, International Traveler Information Systems (ITIS) Phrase Lists
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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/
3.1
application data unit
data unit exchanged between ITS station application instances
3.2
container
group of data frames (3.4) and data elements (3.3) semantically belonging together in one place in the in-
vehicle information (3.8) structure

ISO/DIS 19321:2026(en)
3.3
data element
data type that contains one single datum
[SOURCE: ETSI/TS 102 894-2]
3.4
data frame
data type that contains more than one data element (3.3) in a predefined order
[SOURCE: ETSI/TS 102 894-2]
3.5
detection zone
part of the road network that is passed by a vehicle in approach of the relevance zone (3.16)
3.6
digital map database
structured set of digital and alphanumeric data portraying geographic locations and relationships of spatial
features
[SOURCE: ISO 17572-1:2022, 3.9, modified — Note 1 to entry has been removed.]
3.7
driver awareness zone
parts of the road network in which a message is presented to inform drivers about upcoming situations
3.8
in-vehicle information
information contained in the in-vehicle information data structure that is required by different intelligent
transport system services
3.9
in-vehicle signage
intelligent transport system service that provides static, as well as dynamic, road sign and message sign
information to drivers
3.10
intersection
crossing and/or connection of two or more roads (3.14)
[SOURCE: ISO 17572-1:2022, 3.16, modified — Notes to entry have been removed.]
3.11
link
direct topological connection between two nodes in a given digital mapdatabase (3.6), that has a unique link
ID (3.12)
[SOURCE: ISO 17572-1:2022, 3.19, modified — Admitted term “edge”, domain " and Note 1 to entry
have been removed. The phrase "that has a unique link ID" has been moved to the end of the definition.]
3.12
link ID
link identifier
[locally, globally] identifier that is uniquely assigned to a link (3.11)
[SOURCE: ISO 17572-1:2022, 3.20, modified — Preferred term and admitted term have been exchanged.
Note 1 to entry has been removed.]

ISO/DIS 19321:2026(en)
3.13
minimum dissemination area
parts of the road network where the in-vehicle signage (3.9) message can be received by the potentially
targeted vehicles
3.14
road
part of the road network which is generally considered as a whole and which can be addressed by a single
identification like a road name or road number throughout
[SOURCE: ISO 17572-1:2022, 3.36, modified — Notes 1 and 2 to entry have been removed.]
3.15
road segment
part of a road (3.14), having its start and end along that road
[SOURCE: ISO 17572-1:2022, 3.40, modified — Note to entry has been removed.]
3.16
relevance zone
parts of the road network for which the information in an Application Container is valid
3.17
road works warning
alert for routing road users around road construction and/or road repair
3.18
variable message sign
electronic sign board presenting text, symbols, or a combination of both
4 Abbreviated terms
AVC Automated Vehicle Container
ASN.1 Abstract Syntax Notation One
BLOB data binary large object
C-ITS cooperative intelligent transport systems
DE data element
DENM decentralized environmental notification message
DF data frame
GIC General IVI Container
GLC Geographic Location Container
ID identification
ISC Infrastructure Support Container
ITS intelligent transport systems
ITS-S ITS station
IVI in-vehicle information
IVS in-vehicle signage
ISO/DIS 19321:2026(en)
LAC Layout Container
MAP map data message
MLC Map Location Container
PDU protocol data unit
RCC Road Configuration Container

RWW road works warning
TC Text Container
5 In-vehicle information data structure
5.1 Structural model
5.1.1 General model
The in-vehicle information (IVI) structure represents the application data unit to be transmitted and
received by an ITS station (ITS-S). The IVI structure shall conform to the syntax defined in Annex A as the
data type IviStructure. This means that it shall be composed of Containers defined in this document and it
shall follow the form depicted in Figure 1.
Figure 1 — IVI structure
The IVI structure is extensible and other Containers can be added in the future.
The IVI structure is intended to be encapsulated in a message with the appropriate ITS common header, for
example, the ItsPduHeader of ETSI/TS 102 894-2. The header structure and contents are out of the scope of
this document and are specified in ETSI/TS 103 301, for example.
The IVI structure shall contain a Management Container. The information in the Management Container is
applicable to the entire IVI structure. The presence of this Container is mandatory and it provides a receiving
ITS-S with enough information to handle the IVI structure and decide on its further processing.
The IVI structure can contain one or more Location Container(s). The Location Container describes the
essential information for applications in the receiving ITS-S. Applications can use the location information
to understand how to apply information provided by Application Containers. Location Containers can
carry information relevant for different Application Containers or carry the same content but expressed
in different forms (see 5.2). This enables a receiving ITS-S to choose the appropriate location referencing
system that the ITS-S supports.
The IVI Structure can contain one or more Application Container(s). The Application Container provides IVI
information for use by an application. Application information is self-contained and refers to the location

ISO/DIS 19321:2026(en)
information for its spatial validity. Application information of the same type shall not refer to overlapping
relevance zones. Each Application Container refers to zones defined in the Location Container identified by
their identifications (IDs) for the following usage:
a) detection zone,
b) relevance zone, and
c) driver awareness zone.
An Application Container may optionally provide information about the minimum awareness time, that is,
the minimum time for which the IVI should be available before the vehicle enters the relevance zone. This
MinimumAwarenessTime information can be used by the receiving ITS-S to determine the appropriate driver
awareness zone.
5.1.2 Conceptual zones
When an ITS-S receives the IVI structure, the ITS-S can interpret the application information in the context
of the appropriate location information. Principally, there are four conceptual zones:
a) minimum dissemination area;
b) detection zone;
c) driver awareness zone;
d) relevance zone.
The Minimum Dissemination Area refers to the minimum area where the IVI structure is disseminated by
an ITS-S based on application requirements. The extension of the Minimum Dissemination Area is defined in
the relevant application standards or specification(s) and is therefore out of scope of this document.
In some situations, a vehicle ITS-S needs to be able to detect whether or not it is approaching a relevance
zone at a certain minimum time before it enters the relevance zone. This is, for example, to guarantee that
the relevance zone is detected immediately at its entry (e.g. in case of a very small relevance zone) or to
guarantee that the relevance zone is correctly detected (in case it is near to other road segments, e.g. parallel
or on different altitude level). Therefore, a detection zone occurs in the approach to a relevance zone. In this
way, if a receiving ITS-S moves through the detection zone, it can detect that it is approaching a relevance
zone.
The IVI can be used to inform drivers about upcoming situations in a relevance zone. The driver awareness
zone can be determined by the receiving ITS-S because the driver awareness zone can be based on the
dynamic status of the receiving ITS-S and can depend on the presence of other higher priority information
to be presented. Alternatively, the driver awareness zone can be provided by the sending ITS-S for usage by
the receiving ITS-S.
The relevance zone covers the area where the information in the Application Container is applicable.
Examples of the detection and relevance zones for the spatial validity of the IVI Structure are illustrated in
Figure 2. In traffic direction East (right-hand traffic), i.e. under the green middle barrier, the figure shows
a detection zone and a relevance zone for a speed limit (80 km/h) under slippery road conditions, for the
entire carriageway. The driver awareness zone can be physically overlapping with the detection zone (but is
not necessarily equal in size). In traffic direction West, Figure 2 shows lane-specific detection and relevance
zones for speed limits (80 km/h and 100 km/h) and lane closure (red X).

ISO/DIS 19321:2026(en)
Figure 2 — Spatial validity for IVI: Detection and relevance zones
The Location Container always contains a definition of one or more zones which can represent a detection
zone, a relevance zone, or both. In Figure 2 in traffic direction East, from left to right, the first zone represents
a detection zone and the second zone represents a relevance zone.
In Figure 3 in traffic direction East, from left to right, the first zone represents a detection zone. The second
zone then represents relevance zone 1, and this same zone also serves as a detection zone for relevance zone
2, and so on.
ISO/DIS 19321:2026(en)
Figure 3 — Adjacent relevance zones
5.2 Location referencing
5.2.1 General
There are essentially two different ways of referencing road locations (see ISO 17572-1):
— geographic location referencing, when referencing a regular or irregular division of space which exists
independently of the representation of the road network;
— map-based location referencing, when referencing attributes of the road network itself.
5.2.2 Geographic location referencing
Geographic location referencing systems are coordinate systems in a specified dimension (D) that provide
means for expressing locations as D-tuples of individual coordinates.
An ITS-S sending an IVI Structure provides one or more common reference position(s) in the Geographic
Location Container. The coordinate system in which a particular reference position is defined is specified
implicitly. This reference position is the reference for the description of a static zone or a dynamic (moving)
zone.
There are various op
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