Session report of WP.29 (World Forum for Harmonization of Vehicle Regulations), its Administrative Committee of the 1958 Agreement (AC.1), Executive Committee of the 1998 Agreement (AC.3), and Administrative Committee of the 1997 Agreement (AC.4) held 23-26 June 2026 in Geneva. AC.1 voted on 92 amendments to existing UN Regulations, one corrigendum to UN Regulation No. 79, and three new UN Regulations (Nos. 184-186) on liquid hydrogen vehicle safety, automated driving systems, and tyre abrasion performance. AC.3 established UN GTR on automated driving systems and adopted corrigendum to UN GTR No. 9 and Amendment 2 to UN GTR No. 13. WP.29 extended mandates of several informal working groups and noted accession of Mongolia and Armenia to the 1958 and 1997 Agreements respectively.

Regarding seat belt and airbag use, simulations show steering column intrusion leaves little survival space even at low speeds, so focus should first address energy absorption and compatibility issues before restraint systems. Impact data from six countries (Denmark, France, Lithuania, Luxembourg, Serbia, and the UK) suggest that in 963 bus driver fatalities and severe injuries, severity could potentially have been reduced with improved frontal protection. Cost-benefit analysis should include injuries to small vehicles in collisions with buses. UN R29 and UN R93 should be considered; UN R93 could be amended to include M₃ buses. A real-life demonstration test with a bus is proposed to validate studies conducted.

Proposal to enable application to vehicles of category X (vehicles of category Y are not in scope) with amendments addressing steering wheel hub provisions, cab positioning, and seating requirements for vehicles of category X. Cabs for vehicles of category X mounted in other positions than vehicle front shall not be taken into account for frontal collision simulation.