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UN R9 Supplement 3 (08 series) · UNECE Regulation No. 9 (ECE R9) — Uniform provisions concerning the approval of category L2, L4 and L5 vehicles with regard to sound emission.

UN R9 — Supplement 3 to the 08 series of amendments

Supplement 2 → 3

Adopted at the WP.29 196th sessionEntry into force 2026-01-11
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What changed
  • The surface of the test track in Annex 3 must now conform to ISO 10844:2021 instead of ISO 10844:2014.
  • New paragraph 11.9. accepts ISO 10844:2014 for all approvals until five years from the entry into force of Supplement 3.
  • Annex 1 now gives the average of 2 runs instead of 3, and its ASEP table no longer has the column “Reference Point (ii)”.
Why
  • The amendment allows the use of the latest ISO 10844 test track.
  • ISO updated ISO 10844 to reduce the variability from one test track to another.
  • The amendment also corrects some references and wording about the number of tests.

Q1What changed7 changes

Test track surface to ISO 10844:2021 (Annex 3, para. 2.1.1.)

The surface of the test track must conform to ISO 10844:2021. Before this supplement, it had to conform to ISO 10844:2014.

The surface of the test track shall conform to ISO10844:2014ISO 10844:2021.

Transition from ISO 10844:2014 to ISO 10844:2021 (paras. 11.3., 11.4. and 11.9.)

New paragraph 11.9. accepts ISO 10844:2021 for all approvals from the entry into force of Supplement 3. Paragraph 11.9. also accepts ISO 10844:2014 for all approvals until five years from that date. Paragraphs 11.3. and 11.4. no longer say that the test track may conform to ISO 10844:2014.

From the entry into force of Supplement 3, ISO 10844:2021 shall be accepted for all approvals granted under this Regulation. Until five years from the entry into force of Supplement 3, ISO 10844:2014 shall be accepted for all approvals granted under this Regulation.
Contracting Parties applying this Regulation may grant type approvals according to any preceding series of amendments to this Regulation. However, the specification of the test track may conform to ISO 10844:2014.
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Average of 2 runs in the communication form (Annex 1, item 16.2.)

Item 16.2. now gives the vehicle speed at the start of the acceleration period as the average of 2 runs. Before this supplement, it was the average of 3 runs.

Vehicle speed at the beginning of the period of acceleration (average of 3 2 runs) for gear (i): km/h

ASEP table and reference point (Annex 1, item 18., and Annex 6, para. 3.1.)

The ASEP table in Annex 1 no longer has the column “Reference Point (ii)”. The ASEP table of item 18. now gives the vehicle speeds and engine speeds as the average of 2 runs instead of 3. Annex 6, paragraph 3.1., now says “other than the reference point” instead of “other than the reference points”.

Reference Point (ii) - - (average of 3 2 runs) (km/h) (average of 3 2 runs) (km/h) (average of 3 2 runs) (min-1) (average of 3 2 runs) (min-1)
The Type Approval Authority as well as the Technical Service shall request tests to check the compliance of the vehicle with the requirements of paragraph 2 above. To avoid undue work load testing is restricted to the reference points defined in paragraph 3.3. below and two additional operating conditions other than the reference points point but inside the ASEP control range.
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Q2Why it changed

Proposed by
Experts from the International Motorcycle Manufacturers Association (IMMA)
Working party
GRBP, 81st session (February 2025)

Reasons

  • The amendment allows the use of the latest state-of-the-art ISO 10844 test track.

    Source
    “to allow using the latest state-of-the-art ISO 10844 test track”

  • ISO updated the ISO 10844 standard to reduce the variability from one test track to another. This variability comes from different interpretations and implementations of the technical requirements.

    Source
    “The International Organization for Standardization (ISO) has updated the ISO 10844 standard to reduce track-to-track variability caused by different interpretations and implementations of the technical requirements.”

  • The proposal uses the same approach as earlier amendments to UN Regulations Nos. 51, 41 and 63.

    Sources (2)
    “The proposal follows the same approach as in ECE/TRANS/WP.29/GRBP/2022/13 which was adopted as Supplement 8 to UN Regulation No. 51”
    “as well as GRBP-79-14 and GRBP-79-16 which were adopted as Supplements to respectively UN Regulation No. 41 and UN Regulation No. 63 at the seventy-nineth session of GRBP”

  • Annex 1 gave the average of 3 runs. But Annex 3, paragraphs 3.1.3. and 3.1.4., and the ASEP tests in Annex 6 use the average of 2 runs.

    Sources (2)
    “Annex 1, point 16.2. refers to the average of 3 runs, while Annex 3, paragraphs 3.1.3. and 3.1.4. mention the average of 2 runs”
    “The table in point 18 of Annex 1 refers to the average of 3 runs, while the ASEP reference and ASEP tests are based on the average of 2 runs”

  • The table in item 18 of Annex 1 referred to 2 reference points, and Annex 6, paragraph 3.1., to multiple reference tests. But Annex 6, paragraph 3.3.1., asks for only one ASEP reference test.

    Sources (2)
    “The table in point 18 of Annex 1 refers to 2 reference points, and paragraph 3.1. of Annex 6 refers to multiple reference tests”
    “from Annex 6, paragraph 3.3.1. only one additional sound emission provisions (ASEP) reference test is requested”

Document trail

  1. 2024-12ProposalECE/TRANS/WP.29/GRBP/2025/8Proposal by IMMA
  2. —Working party adoptsECE/TRANS/WP.29/GRBP/79GRBP session report, para. 3
  3. 2025-04Sent to WP.29ECE/TRANS/WP.29/2025/67Text that GRBP sent to WP.29 and AC.1
  4. 2025-06WP.29 adoptsECE/TRANS/WP.29/1186Adopted at the 196th session (session report, para. 111)
  5. 2026-01-11In forceC.N.4.2026.TREATIES-XI.B.16.9UN depositary notification

Q3Who is affected

Vehicle manufacturer

  • Check which edition of ISO 10844 the test track for your approval tests conforms to.
  • Use the average of 2 runs for item 16.2. and for the ASEP table of the communication form.

Component supplier

  • If you test exhaust or silencing systems, check which edition of ISO 10844 the test track conforms to.

Technical service / Approval authority

  • Use a test track that conforms to ISO 10844:2021, or ISO 10844:2014 within the five-year period of paragraph 11.9.
  • Plan to have an ISO 10844:2021 test track before the five-year period in paragraph 11.9. ends.
  • Use the communication form without the column “Reference Point (ii)” in the ASEP table.
  • Compare your ASEP test instructions with the new “reference point” wording in Annex 6.

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

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