GAR | Mechanical Couplings

Series of Amendments and Supplements

Revisions and Amendments

Documents

(Latest posted on 28 Apr 2025)

Meetings

(Last 17 Apr)

UN R55 | 01 series of amendments | Supplement 3 (2012)

UN R55 Mechanical Coupling Components

01 series of amendments | Supplement 3 (2012)

Document WP.29/2011/60

Document WP.29/2011/60/Corr.1

(Also published for convenience by WP.29 in Revision 1 | Amendment 3 and Revision 2.)

Proposal for Supplement 3 to the 01 series of amendments to Regulation No. 55

Reference Number:	WP.29/2011/60
Meeting Session(s):	154th WP.29 session (21-24 Jun 2011)
Document date:	01 Apr 11
Document status:	Adopted text published
Regarding:	UN R55 Mechanical Couplings
Adoption Vote
This proposal (WP.29/2011/60) was adopted by the World Forum. Thirty-one Contracting Parties out of the 38 applying UN R55 were present for the vote by AC.1. Thirty-one voted in favor with zero against and zero abstaining.
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UN R55: Proposal for Supplement 3 to the 01 series of amendments-Corrigendum (French text only)

Reference Number:	WP.29/2011/60/Corr.1
Meeting Session(s):	154th WP.29 session (21-24 Jun 2011)
Document date:	01 Jun 11
Document status:	Adopted by WP.29
Regarding:	UN R55 Mechanical Couplings

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UN R55 | 01 series of amendments | Supplement 2 (2011)

UN R55 Mechanical Coupling Components

01 series of amendments | Supplement 2 (2011)

Document WP.29/2010/66

(Also published for convenience by WP.29 in Revision 1 | Amendment 2 and Revision 2.)

Proposal for Supplement 2 to the 01 series of amendments of Regulation No. 55

Reference Number:	WP.29/2010/66
Meeting Session(s):	151st WP.29 session (22-25 Jun 2010)
Document date:	08 Apr 10
Document status:	Adopted text published
Regarding:	UN R55 Mechanical Couplings
Adoption Vote
This proposal (WP.29/2010/66) was adopted by the World Forum. Thirty-two Contracting Parties out of the 38 applying UN R55 were present for the vote by AC.1. Thirty-two voted in favor with zero against and zero abstaining.
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UN R55 | 01 series of amendments | Supplement 1 (2010)

UN R55 Mechanical Coupling Components

01 series of amendments | Supplement 1 (2010)

(Also published for convenience by WP.29 in Revision 1 | Amendment 1 and Revision 2.)

UN R55 | 01 series of amendments (2001)

UN R55 Mechanical Coupling Components

01 series of amendments (2001)

(Also published for convenience by WP.29 in Revision 1.)

UN R55 | 01 series of amendments | Supplement 4 (2015)

UN R55 Mechanical Coupling Components

01 series of amendments | Supplement 4 (2015)

Document WP.29/2015/7

(Also published for convenience by WP.29 in Revision 1 | Amendment 4 and Revision 2.)

Proposal for Supplement 4 to the 01 series of amendments to Regulation No. 55

Proposal as approved by the GRRF to introduce amendments on requirements for movable couplings, increased range of application of remote controls to couplings similar to C50-X and G50-X, possible increase of characteristic values of standard couplings and to include of further requirements on the mounting of couplings.

Reference Number:	WP.29/2015/7
Meeting Session(s):	165th WP.29 session (10-13 Mar 2015)
Document date:	23 Dec 14
Document status:	Adopted text published
Regarding:	UN R55 Mechanical Couplings
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UN R55 | 01 series of amendments | Corrigendum 1 (2002)

UN R55 Mechanical Coupling Components

01 series of amendments | Corrigendum 1 (2002)

(Also published for convenience by WP.29 in Revision 1 | Corrigendum 1 and Revision 2.)

UN R55 | 01 series of amendments | Supplement 5 (2016)

UN R55 Mechanical Coupling Components

01 series of amendments | Supplement 5 (2016)

Document WP.29/2016/5

(Also published for convenience by WP.29 in Revision 2 | Amendment 1.)

Proposal for Supplement 5 to the 01 series of amendments to Regulation No. 55

Proposal as prepared by the UN R55 informal group and approved by the GRRF to update UN R55 with respect to:
a) Requirements on remote indication;
b) Availability of information on coupling fixing points for A50X couplings;
c) On lateral strength of drawbars; and
d) a new class definition for fully automatic drawbar couplings.

Reference Number:	WP.29/2016/5
Meeting Session(s):	168th WP.29 session (8-11 Mar 2016)
Document date:	22 Dec 15
Document status:	Adopted text published
Regarding:	UN R55 Mechanical Couplings
Adoption Vote
This proposal (WP.29/2016/5), Amended para. 58, was adopted by the World Forum. Thirty-three Contracting Parties out of the 42 applying UN R55 were present for the vote by AC.1. Thirty-three voted in favor with zero against and zero abstaining.
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UN R55 | 01 series of amendments | Supplement 6 (2017)

UN R55 Mechanical Coupling Components

01 series of amendments | Supplement 6 (2017)

Document WP.29/2016/53

(Also published for convenience by WP.29 in Revision 2 | Amendment 2.)

Proposal for Supplement 6 to the 01 series of amendments to Regulation No. 55

Proposal to ensure that coupling balls do not block rear lighting and/or registration plates.

Reference Number:	WP.29/2016/53
Meeting Session(s):	169th WP.29 session (21-24 Jun 2016)
Document date:	05 Apr 16
Document status:	Adopted text published
Regarding:	UN R55 Mechanical Couplings
Adoption Vote
This proposal (WP.29/2016/53) was adopted by the World Forum. Thirty-four Contracting Parties out of the 42 applying UN R55 were present for the vote by AC.1. Thirty-four voted in favor with zero against and zero abstaining.
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UN R55 | 01 series of amendments | Supplement 7 (2018)

UN R55 Mechanical Coupling Components

01 series of amendments | Supplement 7 (2018)

Document WP.29/2017/69

(Also published for convenience by WP.29 in Revision 2 | Amendment 3.)

Proposal for Supplement 7 to the 01 series of amendments to Regulation No. 55

Proposal for:

An amendment for the separation of the procedures to verify towable mass from the procedure of setting and certifying performance values;
An amendment that adds procedures to verify towable mass for vehicle combinations that have hitherto not been accounted for in the Regulation;
Amendments that adds integrated fixing points for secondary couplings;
An amendment that clarifies the procedure to identify worst cases for certification testing;
Amendments that removes typos in the current Regulation.

Please note that, under paragraph 3.4 regarding “Combination 4”, the Clevis coupling formula should read “D_C” rather than “D” as shown.

Reference Number:	WP.29/2017/69
Meeting Session(s):	172nd WP.29 session (20-23 Jun 2017)
Document date:	06 Apr 17
Document status:	Adopted text published
Regarding:	UN R55 Mechanical Couplings
Adoption Vote
This proposal (WP.29/2017/69) was adopted by the World Forum. Thirty-four Contracting Parties out of the 44 applying UN R55 were present for the vote by AC.1. Thirty-four voted in favor with zero against and zero abstaining.
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UN R55 | 01 series of amendments | Supplement 8 (2020)

UN R55 Mechanical Coupling Components

01 series of amendments | Supplement 8 (2020)

Document WP.29/2019/96

(Also published for convenience by WP.29 in Revision 2 | Amendment 4.)

UN R55: Proposal for Supplement 8 to the 01 series of amendments

Proposal to improve the communication document. The current wording of item 2 in Annex 1 is redundant with item 3 and not aligned with similar texts (UN R58 or R73). The key point of item 2 is to identify the type of device or component approved.

Reference Number:	WP.29/2019/96
Meeting Session(s):	179th WP.29 session (12-14 Nov 2019)
Document date:	22 Aug 19
Document status:	Formal WP.29 review
Regarding:	UN R55 Mechanical Couplings
Adoption Vote
This proposal (WP.29/2019/96) was adopted by the World Forum. Thirty-four Contracting Parties out of the 45 applying UN R55 were present for the vote by AC.1. Thirty-four voted in favor with zero against and zero abstaining.
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UN R55 Mechanical Coupling Components

01 series of amendments | Corrigendum 1

UN R55 | 02 series of amendments (2020)

UN R55 Mechanical Coupling Components

02 series of amendments (2020)

Document WP.29/2020/27

(Also published for convenience by WP.29 in Revision 2 | Amendment 5.)

UN R55: Proposal for the 02 series of amendments

Proposal to specify that "the motor-vehicle’s user instructions (e.g. owner’s manual, vehicle handbook) shall clearly specify that the removable or repositionable mechanical coupling device shall always be removed or repositioned when it is not in use.” The purpose is to comply with an EU General Safety Regulation provision that prohibits couplings from obscuring rear lighting components or registration plates.

Reference Number:	WP.29/2020/27
Meeting Session(s):	180th WP.29 session (9-12 Mar 2020)
Document date:	19 Dec 19
Document status:	Adopted text published
Regarding:	UN R55 Mechanical Couplings
Adoption Vote
This proposal (WP.29/2020/27) was adopted by the World Forum. Thirty-six Contracting Parties out of the 45 applying UN R55 were present for the vote by AC.1. Thirty-six voted in favor with zero against and zero abstaining.
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02 series of amendments | Supplement 1 (2021)

UN R55 Mechanical Coupling Components

02 series of amendments | Supplement 1 (2021)

Document WP.29/2020/103

UN R55: Proposal for Supplement 1 to the 02 series of amendments

Proposal to clarify the interpretation of wording for the articulation provided by flexible components.

Reference Number:	WP.29/2020/103
Meeting Session(s):	182nd WP.29 session (10-12 Nov 2020)
Document date:	21 Aug 20
Document status:	Adopted by WP.29
Regarding:	UN R55 Mechanical Couplings
Adoption Vote
This proposal (WP.29/2020/103) was adopted by the World Forum. Thirty-three Contracting Parties out of the 46 applying UN R55 were present for the vote by AC.1. Thirty-three voted in favor with zero against and zero abstaining.
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01 series of amendments | Supplement 9 (2021)

UN R55 Mechanical Coupling Components

01 series of amendments | Supplement 9 (2021)

Document WP.29/2020/132

UN R55: Proposal for Supplement 9 to the 01 series of amendments

Proposal to clarify that flexible components providing part of an articulation are not considered to be a special joint.

Reference Number:	WP.29/2020/132
Meeting Session(s):	182nd WP.29 session (10-12 Nov 2020)
Document date:	04 Sep 20
Document status:	Adopted by WP.29
Regarding:	UN R55 Mechanical Couplings
Adoption Vote
This proposal (WP.29/2020/132) was adopted by the World Forum. Thirty-three Contracting Parties out of the 46 applying UN R55 were present for the vote by AC.1. Thirty-three voted in favor with zero against and zero abstaining.
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01 series of amendments | Supplement 10 (2022)

UN R55 Mechanical Coupling Components

01 series of amendments | Supplement 10 (2022)

Document WP.29/2021/105

UN R55: Proposal for Supplement 10 to 01 series of amendments

Proposal from GRSG to correct the omission of a Corrigendum to remove a subparagraph under paragraph 12.1 in UN R55.

Reference Number:	WP.29/2021/105
Meeting Session(s):	185th WP.29 session (23-26 Nov 2021)
Document date:	02 Sep 21
Document status:	Adopted by WP.29
Regarding:	UN R55 Mechanical Couplings
Adoption Vote
This proposal (WP.29/2021/105) was adopted by the World Forum. Thirty-four Contracting Parties out of the 46 applying UN R55 were present for the vote by AC.1. Thirty-four voted in favor with zero against and zero abstaining.
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02 series of amendments | Supplement 2 (2022)

UN R55 Mechanical Coupling Components

02 series of amendments | Supplement 2 (2022)

Document WP.29/2021/153

UN R55: Proposal for Supplement 2 to 02 series of amendments

Proposal from GRSG to remove a subparagraph under paragraph 12.1 that should not have been included in Revision 2 of the Regulation.

Reference Number:	WP.29/2021/153
Meeting Session(s):	185th WP.29 session (23-26 Nov 2021)
Document date:	02 Sep 21
Document status:	Adopted by WP.29
Regarding:	UN R55 Mechanical Couplings
Adoption Vote
This proposal (WP.29/2021/153) was adopted by the World Forum. Thirty-four Contracting Parties out of the 46 applying UN R55 were present for the vote by AC.1. Thirty-four voted in favor with zero against and zero abstaining.
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01 series of amendments | Corrigendum 2 (2022)

UN R55 Mechanical Coupling Components

01 series of amendments | Corrigendum 2 (2022)

Document WP.29/2022/39

UN R55: Proposal for Corrigendum 2 for the 01 series of amendments

Proposal to correct cross-references. The paragraph 3.3. of Annex 6 is “Drawbar couplings and draw beams” and the paragraph 3.6 is “Drawbars”. Subparagraphs 3.6.1.–3.6.3. prescribe the tests of the drawbars.

Reference Number:	WP.29/2022/39
Meeting Session(s):	186th WP.29 session (7-11 Mar 2022)
Document date:	31 Dec 21
Document status:	Adopted by WP.29
Regarding:	UN R55 Mechanical Couplings
Adoption Vote
This proposal (WP.29/2022/39) was adopted by the World Forum. Thirty-three Contracting Parties out of the 46 applying UN R55 were present for the vote by AC.1. Thirty-three voted in favor with zero against and zero abstaining.
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02 series of amendments | Corrigendum 1 (2022)

UN R55 Mechanical Coupling Components

02 series of amendments | Corrigendum 1 (2022)

Document WP.29/2022/40

UN R55: Proposal for Corrigendum 1 for the 02 series of amendments

Reference Number:	WP.29/2022/40
Meeting Session(s):	186th WP.29 session (7-11 Mar 2022)
Document date:	31 Dec 21
Document status:	Adopted by WP.29
Regarding:	UN R55 Mechanical Couplings
Adoption Vote
This proposal (WP.29/2022/40) was adopted by the World Forum. Thirty-three Contracting Parties out of the 46 applying UN R55 were present for the vote by AC.1. Thirty-three voted in favor with zero against and zero abstaining.
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03 series of amendments (Adopted by WP.29)

UN R55 Mechanical Coupling Components

03 series of amendments

Document WP.29/2024/15

Document WP.29/2024/15/Corr.1

UN R55: Proposal for 03 series of amendments

Proposal to clarify the need to have a support device for centre axle trailers, independent of the type of coupling device.

Reference Number:	WP.29/2024/15
Meeting Session(s):	192nd WP.29 session (4-8 Mar 2024)
Document date:	21 Dec 23
Document status:	Adopted by WP.29
Regarding:	UN R55 Mechanical Couplings
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UN R55: Proposal for 03 series of amendments-Corrigendum

Correction to the summary description: “It is based on ECE/TRANS/WP.29/GRSG/2023/18”.

Reference Number:	WP.29/2024/15/Corr.1
Meeting Session(s):	192nd WP.29 session (4-8 Mar 2024)
Document date:	10 Jan 24
Document status:	Adopted by WP.29
Regarding:	UN R55 Mechanical Couplings
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Reference Number:	GRVA-22-34
Submitted by:	CITA
Meeting Session(s):	22nd GRVA session (2-6 Jun)
Document date:	03 Jun 25
Regarding:	EMB \| PTI: Heavy-duty vehicle braking

Reference Number:	GRVA-22-16
Submitted by:	CATARC
Meeting Session(s):	22nd GRVA session (2-6 Jun)
Document date:	30 May 25
Regarding:	VRU Proximity Awareness