ISO/PRF 20383
(Main)Tractors and machinery for agriculture — Speed Identification Sign (SIS)
Tractors and machinery for agriculture — Speed Identification Sign (SIS)
ISO 20383:2017 specifies the dimensions, characteristics, and positioning of Speed Identification Signs (SIS). These signs indicate the maximum equipment ground speed, based on the ground speed design capability, for an agricultural vehicle. A rear-facing SIS is visible to other operators on public roads approaching the equipment from behind. A forward-facing SIS, mounted on the front of towed equipment, alerts operators of the towing vehicle of the maximum specified ground speed capabilities at which the equipment combination can be operated. ISO 20383:2017 is applicable to self-propelled, semi-integral and towed equipment moving on public roads.
Tracteurs et matériels agricoles et forestiers — Signe d'identification de la vitesse (SIV)
L'ISO 20383 :2017 spécifie les dimensions, les caractéristiques et le positionnement des Signes d'Identification de la Vitesse (SIV). Ces signes indiquent la vitesse au sol maximale du matériel sur la base de la vitesse au sol maximale possible de conception pour un véhicule agricole. Un SIV orienté vers l'arrière est visible pour les autres utilisateurs des voies publiques s'approchant de l'arrière du matériel. Un SIV monté à l'avant d'un matériel remorqué averti les opérateurs du véhicule de remorquage de la vitesse au sol maximale possible spécifiée à laquelle l'ensemble de matériels peut être utilisé. L'ISO 20383 :2017 s'applique aux équipements automoteurs, semi-portés et remorqués se déplaçant sur les voies publiques.
General Information
Relations
Standards Content (Sample)
International
Standard
ISO 20383
Second edition
Tractors and machinery for
agriculture — Speed Identification
Sign (SIS)
Tracteurs et matériels agricoles et forestiers — Signe
d'identification de la vitesse (SIV)
PROOF/ÉPREUVE
Reference number
ISO 20383:2025(en) © ISO 2025
ISO 20383:2025(en)
© 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
PROOF/ÉPREUVE
ii
ISO 20383:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions . 2
5 Materials, performance and test requirements . 3
5.1 Performance requirements .3
5.2 Adhesion .3
5.3 Colour measurement .3
6 Positioning . . 3
6.1 Rear facing SIS .3
6.2 Forward facing SIS .4
6.3 Towed equipment combinations .4
7 Operating instructions for towing vehicles . 4
Bibliography . 6
PROOF/ÉPREUVE
iii
ISO 20383:2025(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 23, Tractors and machinery for agriculture and
forestry, Subcommittee SC 4, Tractors.
This second edition cancels and replaces the first edition (ISO 20383:2017), which has been technically
revised.
The main changes are as follows.
— The term “forestry” was removed from the title.
— In the introduction, the term “implement of husbandry/agricultural equipment” has been replaced with
the term “agricultural field equipment” as defined in ISO 12934.
— In the last sentence of Clause “1 Scope” the list of terms “self-propelled, semi-integral and towed
equipment has been replaced with “agricultural field equipment” as defined in ISO 12934.
— In Clause 1, subclause 6.1.1 and subclause 6.1.3, the term “agricultural vehicle” has been replaced with
“agricultural field equipment” as defined in ISO 12934.
— In 3.2, the definition of “implement of husbandry” has been replaced with the definition of “agricultural
field equipment” according to ISO 12934.
— In Figure 1 of subclause 4.1, the depiction of the symmetrical tolerance has been corrected according to
ISO 129-1.
— In 4.4, the explanation in parenthesis "(e.g. 45 to 50)" has been corrected to "(e.g. 40, 45, 50)".
— ISO 12934 has been added to the Bibiliography.
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.
PROOF/ÉPREUVE
iv
ISO 20383:2025(en)
Introduction
Agricultural field equipment operations include the transport of commodities and equipment from the field
sites to farmsteads, storage facilities and gathering points for movement by mass transit systems. Equipment
often moves between farmsteads and field sites that are not contiguous. Transport may involve moving on
public roads (infrastructure) that permit faster ground speeds than that which is used in the fields or within
the design considerations of the equipment. Design approaches have been identified to permit selected
equipment to move at faster ground speeds in transport configurations. This document provides a means
of
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Date: 2025-06-26
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ISO/TC 23/SC 4/WG
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Secretariat: DIN
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Tractors and machinery for agriculture — Speed Identification Sign
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(SIS)
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numbers
Tracteurs et matériels agricoles — Symbole d’identification et forestiers — Signe d'identification de la vitesse
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(SIV)
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PROOF
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All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
Formatted: Font color: Auto, English (United Kingdom)
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'sISO’s member body in the country of the requester.
Formatted: Font color: Auto, English (United Kingdom)
ISO Copyright Office copyright office
Formatted: Font color: Auto, English (United Kingdom)
CP 401 • Ch. de Blandonnet 8
Formatted: zzCopyright address
CH-1214 Vernier, Geneva
Formatted: Font color: Auto, English (United Kingdom)
Phone: + 41 22 749 01 11
Formatted: Font color: Auto, English (United Kingdom)
Email: copyright@iso.org
Formatted: zzCopyright address
E-mail: copyright@iso.org
Formatted: Font color: Auto, French (Switzerland)
Website: www.iso.orgwww.iso.org
Formatted: French (Switzerland)
Published in Switzerland.
Formatted: Font color: Auto, French (Switzerland)
Formatted: Font color: Auto, French (Switzerland)
Formatted: zzCopyright address
Formatted: Font color: Auto, English (United Kingdom)
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ii
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Contents Page
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Foreword . iv
Not at 0.71 cm + 17.2 cm
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions . 2
5 Materials, performance and test requirements . 3
6 Positioning . 4
7 Operating instructions for towing vehicles . 5
Bibliography . 6
Foreword . iv
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions . 2
5 Materials, performance and test requirements . 3
5.1 Performance requirements . 3
5.2 Adhesion . 3
5.3 Colour measurement . 3
6 Positioning . 4
6.1 Rear facing SIS . 4
6.2 Forward facing SIS . 4
6.3 Towed equipment combinations . 5
7 Operating instructions for towing vehicles . 5
Bibliography . 6
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iii
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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).
Formatted: English (United Kingdom)
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.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.htmlwww.iso.org/iso/foreword.html. Formatted: English (United Kingdom)
This document was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
forestry, Subcommittee SC 4, Tractors.
This second edition cancels and replaces the first edition (ISO 20383:2017), which has been technically Formatted: Default Paragraph Font
revised.
Formatted: Default Paragraph Font
Formatted: Default Paragraph Font
The main changes are as follows.
— — The term “forestry” was removed from the title.
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers, Tab stops:
Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm + 3.5 cm + 4.2
— — In the introduction, the term “implement of husbandry/agricultural equipment” has been replaced
cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
with the term “agricultural field equipment” as defined in ISO 1239412934.
Formatted: Default Paragraph Font
— — In the last sentence of Clause “1“1 Scope” the list of terms “self-propelled, semi-integral and towed
Formatted: Default Paragraph Font
equipment has been replaced with “agricultural field equipment” as defined in ISO 12934.
Formatted: Default Paragraph Font
Formatted: Default Paragraph Font
— — In Clause 1, subclause 6.1.1 and subclause 6.1.3,In 1, 6.1.1 and 6.1.3, the term “agricultural vehicle” has
been replaced with “agricultural field equipment” as defined in ISO 12934. Formatted: Default Paragraph Font
Formatted: Default Paragraph Font
— — In 3.2,In 3.2, the definition of “implement of husbandry” has been replaced with the definition of
Formatted: Default Paragraph Font
“agricultural field equipment” according to ISO 12934.
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— — In Figure 1Figure 1 of subclause 4.1,4.1, the depiction of the symmetrical tolerance has been corrected
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according to ISO 129-1.
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iv
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spacing: single, Tab stops: Not at 0.71 cm
— — In 4.4,4.4, the explanation in parenthesis "(e.g. 45 to 50)" has been corrected to "(e.g. 40, 45, 50)". Formatted: Font: 11 pt
— — ISO 12934 has been added to the Bibiliography. Formatted: Default Paragraph Font
Formatted: Default Paragraph Font
Any feedback or questions on this document should be directed to the user’s national standards body. A
Formatted: English (United Kingdom)
complete listing of these bodies can be found at www.iso.org/members.htmlwww.iso.org/members.html.
Formatted: English (United Kingdom)
Formatted: Font: 10 pt
Formatted: FooterCentered, Left, Space Before: 0 pt, Tab
stops: Not at 17.2 cm
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0 pt, Tab stops: Not at 17.2 cm
v
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Introduction
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Agricultural field equipment operations include the transport of commodities and equipment from the field
sites to farmsteads, storage facilities and gathering points for movement by mass transit systems. Equipment
often moves between farmsteads and field sites that are not contiguous. Transport may involve moving on
public roads (infrastructure) that permit faster ground speeds than that which is used in the fields or within
the design considerations of the equipment. Design approaches have been identified to permit selected
equipment to move at faster ground speeds in transport configurations. This document provides a means of
identifying equipment that has been specifically designed for maximum ground speed, when operating or
travelling on public roads. The means of identification is a Speed Identification Sign (SIS).
Formatted: FooterPageRomanNumber
vi
International Standard ISO 20383: 2025(en)
Formatted: Left
Tractors and machinery for agriculture — Speed Identification Sign
(SIS)
1 Scope
This document specifies the dimensions, characteristics, and positioning of Speed Identification Signs (SIS).
These signs indicate the maximum equipment ground speed, based on the ground speed design capability, for
agricultural field equipment.
This document is applicable to agricultural field equipment moving on public roads.
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,
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the latest edition of the referenced document (including any amendments) applies.
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