GAR | WP.29/2026/194

WP.29/2026/194

UN R171: Proposal for a Supplement 2 to the 01 series of amendments

Source(s)

GRVA

Date

7 Sep 2026

Status

Formal WP.29 review

Subject

UN R171 DCAS

Impact

01 series of amendments | Supplement 2

Meeting(s)

WP.29 | Session 200 | 16-20 Nov

Agenda item 4.9.11. Proposal for Supplement 2 to the 01 series of amendment to UN Regulation No. 171 (DCAS)

Proposal to:

Amend the introduction to clarify that the regulation is established based on current technology and limited vehicle data, with continuous review based on technology development and monitoring data,
Amend the definition of ‘Target Lane’,
Insert a definition of ‘Highway-like road’,
Amend requirements for system boundary detection, steering support at boundaries, manoeuvre initiation conditions, lane change responses, driver unavailability response, and driver disengagement detection,
Amend provisions for withholding of hands-on-requirements on highways and highway-like roads up to 130 km/h,
Insert requirements for system behaviour when driver disengagement is detected during manoeuvres,
Amend approaching vehicle deceleration requirements,
Amend production discontinuation criteria,
Insert documentation requirements for system information strategy and operation phase safety management,
Amend Annex 4 testing provisions to include bicycle target testing and provisions for non-rule-based algorithms,
Amend simulation tool criticality analysis requirements in Annex 5.

Downloads

UNECE server

Related documents

Excerpts from session reports

GRVA | Session 25 | 18-22 May

41. During the consultations, the expert from CLEPA presented the status report of the Task Force on Advanced Driver Assistance Systems (GRVA-25-05), providing an overview of the documents submitted for review and their descriptions, the guidance sought from GRVA on the introduction of the “highway-like road” concept in the 01 series of amendments, and considerations for the next phase of DCAS. The expert from China stated that this concept was incompatible with China’s road classification system. The expert from France noted that the concept was intended for the 02 series of amendments only. The expert from Norway inquired about the potential safety benefits of introducing this concept. The experts reviewed the official documents tabled under this agenda item and considered amendment proposals submitted by the expert from the United Kingdom. They subsequently drafted informal documents GRVA-25-56, GRVA-25-57 and GRVA-25-58.

42. During the official part of this session, GRVA:

Endorsed a status report (GRVA-25-05) of the Task Force on Advanced Driver Assistance Systems.
Noted ECE/TRANS/WP.29/GRVA/2026/15 and ECE/TRANS/WP.29/GRVA/2026/17.
Requested the secretariat to distribute informal GRVA-25-46 (part 3 only) with an official symbol in September 2026.

43. GRVA adopted the following documents and requested the secretariat to submit them to WP.29 and AC.1 for consideration and vote in November 2026:

ECE/TRANS/WP.29/GRVA/2026/16 (amended by GRVA-25-56),
ECE/TRANS/WP.29/GRVA/2026/18 (amended by GRVA-25-57).

44. GRVA adopted ECE/TRANS/WP.29/GRVA/2026/14 (amended by GRVA-25-58) and requested the secretariat to submit it to WP.29 and AC.1 for consideration and vote in June 2026.