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UN R171 Supplement 1 (00 series) · UNECE Regulation No. 171 (ECE R171) — Uniform Provisions Concerning the Approval of Vehicles with regard to Driver Control Assistance Systems.

UN R171 — Supplement 1 to the 00 series of amendments

Base text → Supplement 1

Adopted at the WP.29 194th sessionEntry into force 2025-06-12
What changed
  • Reserved paragraphs 2.14. to 2.16. are deleted, and the later definitions are now numbered 2.14. to 2.30.
  • In Annex 4, paragraphs 4.2.5.1.2.1.1., 4.2.5.1.3.1.1., 4.2.5.2.5.1.1. and 4.2.5.2.6.1.1. now say “full lane change (e.g., 3.5 m lateral displacement)”.
  • Under paragraph 5.5.3.4.1., the system or feature may remain in ‘active’ mode if priority is given to the driver input during the overriding period.
Why
  • Experts from the Task Force on Advanced Driver Assistance System prepared the text with editorial corrections and clarifications.
  • GRVA adopted the proposal with a correction in paragraph 2.28.

Q1What changed104 changes

Definitions: reserved paragraphs deleted and new numbers (paras. 2.14. to 2.30.)

Paragraphs 2.14. to 2.16., which were “(Reserved)”, are deleted. Paragraphs 2.17. to 2.33. are now numbered 2.14. to 2.30. The definition of “Electronic Control System” (para. 2.22.) now ends after “electro-hydraulic elements”. The definition of “Non-Highway” (para. 2.28.) now refers to a highway as defined in paragraph 2.27., not paragraph 2.35. GRVA made the correction to paragraph 2.28. when it adopted the proposal.

–2.16. (Reserved)
2.17.2.14.
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Software identification (para. 10.)

Paragraph 10.1., which read only “Requirements for Software Identification”, is deleted. Paragraphs 10.2. to 10.6. are now numbered 10.1. to 10.5.

Requirements for Software Identification
10.2.10.1.
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Other wording and cross-reference changes

In paragraphs 5.3.5.2., 5.3.7.5.1.1., 5.5.3.4.1.5. and 11.1., the cross-references now end with a full stop, for example “paragraph 2.2.”. Paragraph 5.3.7.2.3.4. no longer has the extra word “manoeuvres” after “A manoeuvre”. Under paragraph 5.5.3.4.1., the system or feature may remain in ‘active’ mode if priority is given to the driver input during the overriding period. Before this supplement, the paragraph began with “The system may remain”. Two paragraphs now say “capable of performing driver-confirmed manoeuvres” and “capable of performing system-initiated manoeuvres”, without the word “a”.

The manufacturer shall describe in detail, as part of the documentation required for Section 9, the system boundary conditions for the system and its features, and the strategies to notify the driver in the event a boundary condition is detected to be exceeded, being met or being approached (as per paragraph 5.3.5.5)..).
A manoeuvre manoeuvres shall only be proposed if there is a justifiable reason for said manoeuvre.
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Communication (Annex 1) and model assessment form (Annex 3)

In the model assessment form in Annex 3, references such as “(Paragraph 3.2 of this Annex)” now read “(paragraph 3.2. of Annex 3)”. Paragraph 4.2.3. of the form now reads “Test results verified according to Annex 3, paragraph 4.1.2.: Yes/No”. Paragraph 4.4. of the form no longer has the words “(the number of this UN Regulation)” after “UN Regulation No. 171”. In Annex 1 (Communication), “Concerning:2” now reads “Concerning:”.

Description of all the control functions of the system, including control strategies (Paragraph paragraph 3.2 . of this Annex 3):
List of input and sensed variables and their working range including a description the effect of the variable on system behaviour (Paragraph paragraph 3.2.1. of this Annex 3):
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Reserved paragraphs deleted in Annexes 3 and 5

In Annex 3, under “System design to be assessed during the audit/assessment”, the “(Reserved)” paragraph 2.1.4. is deleted. In Annex 3, paragraphs 2.1.5. to 2.1.9. under “System design to be assessed during the audit/assessment” are now numbered 2.1.4. to 2.1.8. In the definitions of Annex 5, the “(reserved)” paragraphs 2.1. and 2.2. are deleted. Paragraphs 2.3. to 2.23. of Annex 5 are now numbered 2.1. to 2.21.

(Reserved)
2.1.5.2.1.4.
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Lane change displacement, cyclist target and test wording (Annex 4)

In paragraphs 4.2.5.1.2.1.1., 4.2.5.1.3.1.1., 4.2.5.2.5.1.1. and 4.2.5.2.6.1.1., the full lane change now has “(e.g., 3.5 m lateral displacement)” instead of “(3.5 m lateral displacement)”. Paragraph 4.2.5.2.8.1.2. now says that the VUT approaches the impact point with the cyclist target, not the pedestrian target. The straight approach for at least two seconds before the functional part of the test does not change. Paragraph 4.2.5.1.1.1.1. no longer starts with “Functional part I:”.

Functional part I: The VUT speed shall remain in the range declared by the manufacturer in paragraphs 9.1.1. and 9.1.2. of this UN Regulation.
The VUT shall perform a full lane change (e.g., 3.5 m lateral displacement) into the adjacent lane after the driver initiated the LCP.
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Scenario names and test references (Annexes 3 and 4)

In the declaration of system capability in Annex 3, “Operating domain requirement” now reads “Operating domain”. The scenario “Stationary pedestrian target ahead in lane” now reads “Stationary pedestrian ahead in lane”. In the Annex 4 table, the test references for “Equivalent performance of other safety systems” now include 4.2.5.2.4. and 4.2.5.2.11.1. instead of 4.2.5.2.4.1. and 4.2.5.2.7.1.

Operating domain requirement Stationary pedestrian target ahead in lane (Annex 4, par. 4.2.5.2.7.1.)
4.2.5.2.4.1. 4.2.5.2.7.1. 4.2.5.2.4. 4.2.5.2.11.1.
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Q2Why it changed

Proposed by
Experts from the Task Force on Advanced Driver Assistance System
Working party
GRVA, nineteenth session

Reasons

  • Experts from the Task Force on Advanced Driver Assistance System prepared the text with editorial corrections and clarifications.

    Source
    “The text reproduced below was prepared by the experts from Task Force on Advanced Driver Assistance System with editorial corrections and clarifications.”

Document trail

  1. 2024-04ProposalECE/TRANS/WP.29/GRVA/2024/23Proposal by the experts from the Task Force on Advanced Driver Assistance System
  2. —Working party adoptsECE/TRANS/WP.29/GRVA/19GRVA session report, para. 50
  3. 2024-08Sent to WP.29ECE/TRANS/WP.29/2024/146Text that GRVA sent to WP.29 and AC.1
  4. 2024-11WP.29 adoptsECE/TRANS/WP.29/1181Adopted at the 194th session (session report, para. 158)
  5. 2025-06-12In forceC.N.351.2025.TREATIES-XI.B.16.171UN depositary notification

Q3Who is affected

Vehicle manufacturer

  • Update your documents that cite definitions 2.17. to 2.33. or paragraphs 10.2. to 10.6. to the new numbers.

Component supplier

  • No direct action for this role.

Technical service / Approval authority

  • In paragraphs 4.2.5.1.2.1.1., 4.2.5.1.3.1.1., 4.2.5.2.5.1.1. and 4.2.5.2.6.1.1., treat 3.5 m lateral displacement as an example of a full lane change.
  • Under paragraph 4.2.5.2.8.1.2., use the cyclist target for the straight approach of at least two seconds before the functional part.

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ⓘ This report gives advice only. It is not legal or type-approval advice.

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