62. The Chair of the TF on ADAS presented (GRVA-20-21) the report on the activities of the group since the last GRVA session. He provided general information about the Driver-Control Assistance System (DCAS) operation, he recalled the DCAS regulatory concept, he presented the draft amendments to UN Regulation No. 171 submitted by the task force for consideration at this session, and he sought guidance from GRVA on open items.
63. The representative of FIA supported UN Regulation No. 171 (DCAS) in its original form but expressed concerns with the proposed 01 series of amendments. He pointed out a potential discrepancy in the presentation regarding the need for trainings: slide 15 mentioned that there is no need to train the driver to become a DCAS supervisor, while slide 20 mentioned that in general, drivers shall be educated and trained to operate vehicles equipped with DCAS. The Chair of the TF on ADAS explained that the latter was general about minimizing drivers’ complacency and overreliance. He agreed to clarify the presentation. The representative of CLEPA explained that the Human-Machine Interface requirements in UN Regulation No. 171 were the reason why no general training on DCAS was needed.

66. GRVA reviewed ECE/TRANS/WP.29/GRVA/2024/32 as amended by informal document GRVA-20-22 and discussed the open issues (also listed in GRVA-20-21). The representative of OICA provided input on the open issues in GRVA-20-37. GRVA:

1. Agreed to include the new paragraph 17 proposed by Japan (GRVA-20-08).
2. Discussed whether to limit the operational conditions for the System-Initiated Manoeuvres (SIM) and agreed to only allow SIM on motorways for systems not withholding the Hands-On Request to reach consensus on SIM.
3. Agreed, following discussion, with option 2 for para. 5.5.3.2.1.
4. Discussed the remaining items related to periodic monitoring (GRVA-20-49).
5. Reviewed the editorial corrections proposed by China (GRVA-20-34).
6. Discussed timing considerations on DCAS Lane Change Procedure (GRVA-20-58).
7. Discussed the means to ensure that drivers understand the limitations of the system and their responsibilities when the system is operating, particularly for system-initiated manoeuvres (GRVA-20-57 and Rev.1 as well as GRVA-20-60).

68. GRVA approved the next steps for the IWG on ADAS as proposed in GRVA-20-21/Add.1.

39. The representative of the Russian Federation, Chair of the Task Force on ADAS, presented the status report (GRVA-23-37) listing the activities performed by the task force since the twenty-second GRVA session in line with the mandate received by GRVA at the twentieth GRVA session (GRVA-20-21/Add.1). He detailed the approach taken for extending system-initiated manoeuvres and the conditions of withholding the hands-on requests. He provided an indicative schedule the next deliverables expected from the group. The representative of Norway welcomed the status report and the approach taken for the Phase III of development of UN Regulation No. 171. He noted the challenge posed by driver engagement with these systems, for which countermeasures were needed.

40. GRVA endorsed the status report received.

54. The representative of the Russian Federation, Chair of the Task Force on ADAS, presented the status report (GRVA-24-16), listing the activities performed by the task force since the twenty-third GRVA session, as mandated at the twentieth GRVA session (see GRVA-20-21/Add.1). He detailed the activities conducted under Phase 3 of the development of UN Regulation No. 171 and the production of the draft 02 series of amendments to UN Regulation No. 171 (DCAS). The representative of China inquired about the frequent amendments to that regulation and asked whether there was evidence demonstrating that the earlier series provided sufficient safety. He noted that China was closely monitoring this regulation while developing its corresponding national standard and asked whether any evaluations, surveys, or feedback loops on safety had been carried out prior to adopting the amendments. The representative of Norway raised a similar question. The Task Force Chair explained that the work of the task force had been organized in phases, and that each phase leading to a new series of amendments introduced additional use cases in the regulation and were not intended to address safety deficiencies of previous versions. The GRVA Chair recalled that the expectation for this regulation, like any other under the GRVA purview, was that it improves safety. He mentioned that GRVA would welcome safety-related data from all delegations.

55. GRVA reviewed the proposal (ECE/TRANS/WP.29/GRVA/2026/4, as amended by GRVA-24-17) for the 02 series of amendments to UN Regulation No. 171 (DCAS) and comments provided by the delegations, including GRVA-24-41/Rev.1.

56. The Task Force Chair also presented provisions from the draft 02 series of amendments to UN Regulation No. 171 with relevance for the 01 series (GRVA-24-18) as well as proposed supplements to the original version of UN Regulation No. 171 and its 01 series of amendments. He provided spitted versions (i.e. GRVA-24-18-A, GRVA-24-18-B, GRVA-24-19-A, and GRVA-24-18-B, specific for each relevant series). He consolidated all amendments received in GRVA-24/17/Rev.1. GRVA agreed to resume consideration of GRVA-24-18 (A and B) and requested the secretariat to distribute GRVA-24-19 (A and B) with an official symbol at the twenty-fifth session. GRVA also agreed to discuss the future of the task force. The representative of Norway stated his reservations with the draft proposal. He welcomed the enhancements proposed to the Driver Monitoring System (DMS) provisions but noted that the extensions given to hands off situations and system-initiated manoeuvres may make DCAS too close to ADS.

57. GRVA adopted ECE/TRANS/WP.29/GRVA/2026/4, as amended by GRVA-24-17/Rev.2, as draft 02 series of amendments to UN Regulation No. 171 and requested the secretariat to submit it to WP.29 and AC.1 for consideration and vote at their June 2026 sessions.