Chronology summarizing the discussions held on agricultural coupling requirements under UN R55 since 2011.

Proposal to allow for a vertical load up to 80 kg for drawbar coupling designs with a jaw that pivots about the horizontal transverse axis because such configurations are commonly used in fire trucks and other special use vehicles in Germany, Austria and Switzerland.

Revised version of document GRRF-80-41 pursuant to the 12th UN R55 informal group session. GRRF-80-41 was the revised formal proposal to 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.

Informal group schedule for finalizing amendments to update UN R55.

Proposed text for determining worst case conditions for physical testing of couplings.

Revised proposal developed by the UN R55 informal group to introduce provisions for mechanical couplings used in modular vehicle combinations (e.g., rigid truck + dolly + semi-trailer) presently not addressed within the regulation.

Proposal as developed by the UN R55 informal group during its 12th session. 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.

Pending requests and future items for changes to UN R55.

Working draft proposal of the R55 informal group to introduce amendments concerning:
(a) Identification of worst cases for design assessment, and
(b) Procedures for COP.

Proposal to introduce provisions for minimum articulation of couplings in order to prevent damage from maneuvers that exceed coupling capacities.

Draft proposal of the informal group on UN Regulation No. 55 to modify Figure 17 – annex 5 – Dimensions of spring-mounted steering wedges.

Proposal for a higher vertical load for drawbar couplings with a jaw that pivots about the horizontal transverse axis.

Working draft proposal of the UN R55 informal group for a uniform procedure to rate couplings for extreme heavy transport configurations based upon a speed-reduction method. The intent is to address conditions where there are no coupling products with appropriate certified performance values.

Information on TAAM discussions concerning cases where the sum of the mass of the towing vehicle (M) [T] and the mass of the towed vehicle (TM) [R or C] is higher than the maximum combination mass (MC) set for the towing vehicle.

Correspondence concerning the French position on this work item.

Draft text to introduce provisions for minimum articulation of couplings in order to prevent damage from maneuvers that exceed coupling capacities.

Proposal to introduce a procedure to identify allowable combinations of performance values DC and V for drawbar coupling equipment.

Draft proposal to introduce amendments on a procedure to dimension coupling equipment for heavy transports through speed reduction.

Draft proposal to introduce amendments on a procedure to dimension coupling equipment for heavy transports through speed reduction.

Copy of the proposal by Poland to amend UN R55 to ensure that coupling devices are only approved for use on vehicles approved for towing trailers.

UN R55 informal group working draft to introduce:

• Correction error in annex 5 figure 12 and 17
• An amendment that concerns identification of worst cases for design assessment
• Clarifications on minimum articulation angles.

Working draft amendment to UN R55 to introduce:

• An amendment that concerns a separation of requirement calculation procedures from the procedure of setting and certifying performance values.
• An amendment that adds procedures for requirement calculation for vehicle combinations that have hitherto not been accounted for in the regulation.

Proposal to introduce amendments on the secondary coupling and the attachment points.

UN R55 informal group working draft to introduce:

• Correction error in annex 5 figure 12 and 17
• An amendment that concerns identification of worst cases for design assessment
• Clarifications on minimum articulation angles.

Proposal to introduce amendments on the secondary coupling and the attachment points.

Proposal to introduce amendments on the secondary coupling and the attachment points.

Proposal to introduce a procedure to identify allowable combinations of performance values DC and V for drawbar coupling equipment.

Working draft amendment to UN R55 to introduce:

• An amendment that concerns a separation of requirement calculation procedures from the procedure of setting and certifying performance values.
• An amendment that adds procedures for requirement calculation for vehicle combinations that have hitherto not been accounted for in the regulation.