UN R55 does not include provisions for minimum articulation angles of couplings. However, couplings may be damaged if a vehicle combination takes a narrow curve or other maneuver that exceeds the coupling design. In order to prevent coupling failures, this proposal suggests minimum articulation requirements based partly upon ISO 1726-1 and 11407 for drawbar and fifth wheel couplings.

Updated version of the text following the 11th R55 informal group session and highlighting the changes

Updated version of the draft consolidated revision of UN R55 following the 11th R55 informal group session.

Draft proposal under development within the R55 informal group.

Proposal under preparation for the GRRF by the R55 informal group. This proposal concerns a procedure to identify allowable combinations of performance values Dc and V for drawbar coupling equipment. This proposal would amend the Revision 2 proposal for UN R55.

The text reproduced below was prepared by the experts of the informal group on UN Regulation No. 55 and introduces amendments on:
a) Requirements on remote indication;
b) Availability of information on coupling fixing points for A50X couplings;
c) On lateral strength of drawbars;
d) Includes a new class definition for fully automatic drawbar couplings.

List of pending proposals for the update to UN R55 from GRRF participants.

Australia Road Research Board (ARRB) Internal Report related to ISO/TC22/SC15/WG4 N 535 Annex 5.

WABCO comments concerning communication between vehicles, power supply redimensioning, and vehicle stability requirements (including use of electronic vehicle stability control systems).

Australian research paper suggesting that an air-suspended tandem converter dolly could pitch significantly under braking as compared to mechanically suspended dollies.

Working draft of the comprehensive update to UN R55 from the Informal Group on Amendments to UN R55.01.

E-mail communication between the WP.29 secretariat and the UN R55 revision informal group proposing the drafting of a new consolidated version of the amended regulation incorporating all the informal group changes.

Revised drawings prepared for the informal working group amending the regulation.

Presentation to explain the historical background behind the work of ISO/TC22/SC15/WG4 and the UN R55 informal working group.

Review of the development of ISO 12357-3.

History of discussions concerning the D-value on modular vehicles and combinations with more than one trailer.

Text as approved by the GRRF and prepared by the UN R55 informal group to update this regulation 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.

Proposal to ensure that coupling balls do not block rear lighting and/or registration plates. In line with the EU General Safety Rule, Annex IV specification for application of UN R55, couplings that might block lighting or plates must be removable, repositionable, and unlockable in order to make it easier for users to remove them or reposition them when not in use (e.g., towing a trailer.) Coupling balls that are so designed as to be unable to block lighting or plates may still incorporate locks and/or require tools to remove or reposition.

Reworked version of document TFAC-05-10.

Reworked and restructured version of document TFAC-05-10.

Proposal to introduce amendments to the test procedure and installation requirements of couplings belonging to classes K and L.

Proposal draft by the informal group on UN Regulation No. 55 to update this regulation 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.

Proposal by the informal working group on Regulation No. 55 to amend the definition of Class S couplings.

Proposal to introduce amendments on:
a) Requirements on remote indication;
b) Availability of information on coupling fixing points for A50X couplings;
c) On lateral strength of drawbars;
d) Includes a new class definition for fully automatic drawbar couplings.

Proposal to introduce amendments on applications in multi-vehicle combinations.

Proposal to introduce amendments on the test procedure and installation of couplings belonging to class K and L.

Report of the task force on agricultural vehicle couplings.

Second revision of the draft text proposing to introduce amendments on the test procedure and installation of couplings belonging to classes K and L.

Report from the meeting of the Small Group for definition of Formulas and Test procedure for agricultural towing devices.

Working draft amendment to UN R55 from the Informal Group on Amendments to UN R55.01.

Working draft proposal from the informal group on Regulation No. 55 to update the provisions concerning Class K hook-type couplings when coupled with class L toroidal drawbar eyes.

Class S couplings refer to non-standard national/regional couplings that remain in use despite the broad trend towards harmonization around an agreed set of couplings specifically covered by other UN R55 classes. The aim of this proposal is to tighten and clarify the requirements for such couplings while discouraging the development of new non-standard Class S couplings (such that new designs would result in new classes if needed).

Draft proposal by the informal group on UN Regulation No. 55 to introduce amendments concerning coupling applications in multi-vehicle combinations.

The pending Revision 3 to the 1958 Agreement opens the way for virtual or simulation testing for use in type approvals. This presentation considers the proposed amendment and its application to mechanical coupling approvals.

Working draft proposal of the informal group on UN Regulation No. 55 to introduce amendments on:
(a) Requirements on remote indication;
(b) Availability of information on coupling fixing points for A50X couplings;
(c) On lateral strength of drawbars;
(d) Includes a new class definition for fully automatic drawbar couplings.

Expanded version of the earlier information in document R55-08-13.

KBA has noticed that class H50 couplings are not defined and so proposes to add this class and definitions to UN R55.

Reformatted working draft text prepared by the informal group on UN Regulation No. 55 to introduce provisions for agricultural couplings and related applications.

UN R55 Revision 2 draft as amended by GRRF/2014/28 (GRRF/2015/7, Supplement 4 to the 01 series), GRRF/2015/14, and R55-08-05.

The text prepared by the informal group of experts on Regulation No. 55 to introduce amendments on the test procedure and installation of couplings belonging to classes K and L.

Revised list of open issues pursuant to the 3rd MVC informal group session.