The Informal Working Group on Advanced Emergency Braking System held its 2nd meeting on 18 June 2026. Australia had submitted documents GRVA/2026/21 and GRVA-25-36 proposing amendments to UN R152. For para. 2.14, the group agreed to insert a footnote stating “this value is understood to be a minimum value,” with a working document to be prepared for next GRVA. For para. 5.2.1.1, Australia withdrew its proposal to remove the 0.8s TTC warning condition after safety concerns were raised. CLEPA-OICA, UK and Australia will prepare a clarification proposal for next GRVA.

The agenda includes GRVA decision to refer GRVA-2026-21 and GRVA-25-36 to the IWG on AEBS, proposals to amend UN R152 paragraphs 2.14, 5.2.1.1 and 5.2.1.2 per documents ECE/TRANS/WP.29/GRVA/2026/21 and GRVA-25-36, other business, action items and next meetings scheduled 24–25 September 2026 and 2–4 November 2026.

Australia proposes to amend para. 2.14. to clarify that the nominal Peak Braking Coefficient value is understood to be the minimum value, and to amend para. 5.2.1.1. to simplify collision warning requirements for vehicles of category M₁. Industry objects the para. 2.14. amendment as unnecessary and potentially subject to misinterpretation as a requirement change. Industry agrees with dropping the 0.8-second prior warning requirement but finds the resulting text difficult to understand and proposes alternative wording that harmonizes para. 5.2.1.1. with paras. 5.2.2.1. and 5.2.3.1., specifying that a collision warning shall be provided no later than the start of emergency braking intervention.