81. The expert from CLEPA introduced ECE/TRANS/WP.29/GRVA/2022/9, with an amendment proposal to UN Regulation No. 13, aimed at resolving problems with installation of stronger spring brake actuators in trailers to realize higher deceleration in the case of emergency braking caused by a cut of the supply line between towing vehicle and trailer.

82. GRVA adopted ECE/TRANS/WP.29/GRVA/2022/9 and requested the secretariat to submit it as draft supplement to the 11 and 12 series of amendments to UN Regulation No. 13 to WP.29 and AC.1 for consideration and vote at their June 2022 sessions.

83. The expert from OICA presented GRVA-12-25, recalling the purpose of ECE/TRANS/WP.29/GRVA/2022/10, aimed at clarifying paragraph 5.2.22.2. in UN Regulation No. 13-H, which dealt with deceleration thresholds generating braking light signal in the case of regenerative braking and/or automatically commanded braking. GRVA adopted ECE/TRANS/WP.29/GRVA/2022/10 as amended by GRVA-12-24 (reproduced in Annex IV of the session report) and requested the secretariat to submit it as draft supplement to UN Regulation No. 13-H to WP.29 and AC.1 for consideration and vote at their June 2022 sessions.

84. The expert from OICA presented GRVA-12-48, proposing to allow that the required warning actuation may be delayed until the parking brake was in a stable state. The proposal received comments from France, Germany, United Kingdom of Great Britain and Northern Ireland and Russian Federation. GRVA agreed that the expert from OICA, in consultation with interested Contracting Parties, would submit a revised proposal on the basis of ECE/TRANS/WP.29/GRVA/2022/11, at its May 2022 session.