10 July UN R51: Draft proposal for corrections to the 03 series of amendments R51/R138-12-04	R51/R138-12-04	2025-07-10
8 July Minutes of drafting group on UN R51 and EV sound provisions (UN R51/UN R138) R51/R138-12-03	R51/R138-12-03	2025-07-08
1 July R51/R138: Agenda for the 12th (July 2025) session R51/R138-12-01	R51/R138-12-01	2025-07-01
1 July Background on proposal for setting sound limits (OICA) R51/R138-12-02	R51/R138-12-02	2025-07-01
24 June Minutes of the 11th (June 2025) R51/R138 informal subgroup session R51/R138-11-04	R51/R138-11-04	2025-06-24
20 June Minutes of the 10th (June 2025) R51/R138 informal subgroup session R51/R138-10-03	R51/R138-10-03	2025-06-20
20 June Vehicle external sound: Questions to be discussed R51/R138-11-02	R51/R138-11-02	2025-06-20
20 June Proposal for Exterior Sound Enhancement System (ESES) requirements (OICA) R51/R138-11-03	R51/R138-11-03	2025-06-20
20 June Key points on Exterior Sound Enhancement Systems/Exterior Sound Generator requirements R51/R138-11-01	R51/R138-11-01	2025-06-20