GRSG-129-41
UN R73: Proposal for 02 series of amendments

Proposal aims to make extendible trailers conform to all lateral protection requirements for trailers regardless of length, in order to remove the safety risk to vulnerable road users when the trailer is in the fully extended position. This is achieved by the removal of section 13.1.1. and 16.1.1 that specify some exemptions to requirements when the trailer is extended.

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Excerpts from session reports
GRSG | Session 129 | 7-11 Apr 2025

15. The expert from Japan presented GRSG-129-20 to reintroduce ECE/TRANS/WP.29/GRSG/2024/38, amended by GRSG-129-21, that improves the effectiveness of Lateral Protection Device (LPD) in preventing left- and right-turn collisions. He underlined the benefits of low ground clearance making LPD more effective by summarizing accidentology data. The expert from the United Kingdom recommended a careful assessment of accidentology, since many of the vehicles still in circulation required exemptions on side guards. He then introduced ECE/TRANS/WP.29/GRSG/2025/3 and GRSG-129-41 amending it, which propose different transitional provisions. The expert from Italy introduced GRSG-129-47-Rev.2, to ensure the correct interpretation of the exemptions on the height of LPD by the Type Approval Authorities. The expert from CLCCR introduced GRSG-129-46 urging that the proposal be paused pending further review, since an impact assessment is needed to confirm costs versus expected benefits. He added that the correct method involves calculating the angle between two ramps using the tangent function based on ground clearance and wheelbase. Finally, GRSG adopted GRSG-129-21-Rev.5, superseding GRSG-129-22, which incorporates the proposals from the experts of the United Kingdom and GRSG-129-47-Rev.2; see annex V of this report. The secretariat was requested to submit the amendments as the proposal of the 02 series of amendments to UN Regulation No. 73, for consideration and vote at the November 2025 sessions of WP.29 and AC.1.