15 Jan	R51/R138 Subgroup: Minutes of the 3rd (December 2024) session	R51/R138-03-08/Rev.1	2025-01-15
13 Jan	RD-ASEP: UN R51 and R138 questions to be discussed	R51/R138-03-09	2025-01-13
13 Jan	R51/R138 Subgroup: Agenda for the 4th (January 2025) session	R51/R138-04-01	2025-01-13
13 Jan	RD-ASEP: Comments on corrections to the 03 series of amendments (OICA)	R51/R138-04-02	2025-01-13
15 Jan	UN R51: Proposal for an update of Supplement 11 to the 03 series of amendments (OICA)	R51/R138-04-03	2025-01-15
23 Jan	R51/R138 Subgroup: Agenda for the 5th (January 2025) session	R51/R138-05-01	2025-01-23
29 Jan	RD-ASEP, UN R51 and R138: Synthesis of discussions	R51/R138-05-02	2025-01-29
29 Jan	Minutes of the 4th R51/R138 subgroup session	R51/R138-05-03	2025-01-29
30 Jan	RD-ASEP UN R51/R138 subgroup status report to GRBP	R51/R138-05-04	2025-01-30
14 Feb	R51/R138 Subgroup: Minutes of the 5th (January 2025) session	R51/R138-05-05	2025-02-14
19 Feb	UN R51 and R138 RD-ASEP: Questions to be discussed	R51/R138-05-06	2025-02-19
13 Mar	R51/R138 Subgroup: Agenda for the 6th (March 2025) session	R51/R138-06-01	2025-03-13
18 Mar	UN R51/R138 RD-ASEP feedback from the 81st GRBP session and remaining questions	R51/R138-06-02	2025-03-18
10 Apr	R51/R138 Subgroup: Minutes of the 6th (March 2025) session	R51/R138-06-03	2025-04-10
21 Mar	R51/R138 Subgroup: Agenda for the 7th (April 2025) session	R51/R138-07-01	2025-03-21
21 Mar	UN R138: Questions on RD-ASEP tests	R51/R138-07-02	2025-03-21
4 Apr	UN R51: Supplement 11-Timeline and Explanation of Changes in GRBP/2024/22 (OICA)	R51/R138-07-03	2025-04-04
10 Apr	UN R51: Proposal for corrections to the 03 series (EC)	R51/R138-07-04	2025-04-10
10 Apr	UN R51: Comments on proposed corrections (Supplement 11 to 03 series)	R51/R138-07-05	2025-04-10
30 Apr	R51/R138 Subgroup: Agenda for the 8th (April 2025) session	R51/R138-08-01	2025-04-30
30 Apr	UN R51: Proposal for corrections to the 03 series of amendments	R51/R138-08-02	2025-04-30
30 Apr	UN R51: Comments on the draft proposal for a Supplement 11 to the 03 series	R51/R138-08-03	2025-04-30
26 May	R51/R138 Subgroup: Minutes of the 8th (April 2025) session	R51/R138-08-04	2025-05-26
26 May	R51/R138 Subgroup: Agenda for the 9th (June 2025) session	R51/R138-09-01	2025-05-26
4 Jun	UN R138: Structuring proposal for 03 series (OICA)	R51/R138-09-02	2025-06-04
5 Jun	UN R51: Proposal for corrections to the 03 series (EC)	R51/R138-09-03	2025-06-05
5 Jun	UN R51: Proposal for corrections to the 03 series (EC)	R51/R138-09-04	2025-06-05
5 Jun	R51/R138 Subgroup: Agenda for the 10th (June 2025) session	R51/R138-10-01	2025-06-05
5 Jun	Key points on exterior sound enhancement testing requirements	R51/R138-10-02	2025-06-05
20 Jun	R51/R138 Subgroup: Minutes of the 10th (June 2025) session	R51/R138-10-03	2025-06-20
5 Jun	UN R51: Proposal for corrections to the 03 series (EC)	R51/R138-10-04	2025-06-05
20 Jun	Key points on Exterior Sound Enhancement Systems/Exterior Sound Generator requirements	R51/R138-11-01	2025-06-20
20 Jun	Vehicle external sound: Questions to be discussed	R51/R138-11-02	2025-06-20
20 Jun	Proposal for Exterior Sound Enhancement System (ESES) requirements (OICA)	R51/R138-11-03	2025-06-20
15 Aug	R51/R138 Subgroup: Minutes of the 11th (June 2025) session	R51/R138-11-04/Rev.1	2025-08-15
1 Jul	R51/R138 Subgroup: Agenda for the 12th (July 2025) session	R51/R138-12-01	2025-07-01
1 Jul	Background on proposal for setting sound limits (OICA)	R51/R138-12-02	2025-07-01
8 Jul	Minutes of drafting group on UN R51 and EV sound provisions (UN R51/UN R138)	R51/R138-12-03	2025-07-08
10 Jul	UN R51: Draft proposal for corrections to the 03 series of amendments	R51/R138-12-04	2025-07-10
28 Jul	Technical Background dLASEP Term (HMG)	R51/R138-12-05	2025-07-28
15 Aug	R51/R138 Subgroup: Minutes of the 12th (July 2025) session	R51/R138-12-06	2025-08-15
1 Aug	R51/R138 Subgroup: Agenda for the 13th (August 2025) session	R51/R138-13-01	2025-08-01
1 Aug	UN R51: Proposal for corrections to the 03 series of amendments (OICA)	R51/R138-13-02	2025-08-01
1 Aug	UN R51: Draft proposal to amend document GRBP/2025/29	R51/R138-13-03	2025-08-01
1 Aug	UN R51: Proposal for corrections to the 03 series of amendments (OICA)	R51/R138-13-04	2025-08-01
1 Aug	UN R51: Draft guidance on interpretation of the footnote on generated sounds	R51/R138-13-05	2025-08-01
14 Aug	UN R138: Draft amendment on AVAS sound levels	R51/R138-13-06/Rev.1	2025-08-14
1 Aug	UN R51: Comments on draft Supplement proposal (Annex 7)	R51/R138-13-07	2025-08-01
1 Aug	UN R51: Comments on the draft text for Supplement 11	R51/R138-13-08	2025-08-01
4 Aug	UN R51: Comments on the draft text for Supplement 11	R51/R138-13-09	2025-08-04
28 Aug	UN R51: Comments on the draft Supplement 11 (exterior sound systems)	R51/R138-13-10	2025-08-28
15 Aug	R51/R138 Subgroup: Minutes of the 13th (August 2025) session	R51/R138-13-11	2025-08-15
1 Sep	R51/R138 Subgroup: Agenda for the 14th (September 2025) session	R51/R138-14-01	2025-09-01
1 Sep	RD-ASEP UN R51/138 subgroup draft status report to GRBP	R51/R138-14-02	2025-09-01
1 Sep	UN R51: Comments on corrections to the 03 series of amendments	R51/R138-14-03	2025-09-01
1 Sep	UN R51: Draft proposal to amend working document GRBP/2025/29	R51/R138-14-04	2025-09-01
14 Oct	R51/R138 Subgroup: Agenda for the 15th (October 2025) session	R51/R138-15-01	2025-10-14
14 Oct	UN R51: Amendments to the draft Supplement to the 03 series	R51/R138-15-02	2025-10-14
21 Oct	UN R51: Proposals to amend documents GRBP/2025/29 and GRBP-82-08 (OICA)	R51/R138-15-03	2025-10-21
22 Oct	UN R51: Proposals for amendments based on GRBP/2025/29 (OICA)	R51/R138-15-04	2025-10-22
22 Oct	UN R138: Subgroup discussion on AVAS and EES	R51/R138-15-05	2025-10-22
10 Nov	R51/R138 Subgroup: Agenda for the 16th (November 2025) session	R51/R138-16-01	2025-11-10
10 Nov	UN R51: Comments on draft provisions to amend the regulation	R51/R138-16-02	2025-11-10
1 Dec	R51/R138 Subgroup: Agenda for the 17th (December 2025) session	R51/R138-17-01	2025-12-01
1 Dec	UN R51: Working draft proposal to amend document GRBP/2026/4	R51/R138-17-02	2025-12-01