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UN R21 Supplement 5 (01 series) · UNECE Regulation No. 21 (ECE R21) — Uniform provisions concerning the approval of vehicles with regard to their interior fittings.

UN R21 — Supplement 5 to the 01 series of amendments

Supplement 4 → 5

Adopted at the WP.29 194th sessionEntry into force 2025-06-12
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What changed
  • This supplement deletes the procedure text in Annex 5 and its three appendices.
  • Annex 5 now refers to Addendum 6 of Mutual Resolution No. 1 (M.R.1) for the procedure.
  • In footnote 1 to paragraph 4.4.1., a reference to R.E.3 replaces the list of country numbers.
Why
  • The specifications of the 3-D “H”-point machine were updated and moved from R.E.3 to M.R.1.
  • A calibration procedure was added, so that the machine gives consistent test results among all Regulations.
  • The proposal updates references to the latest amendment (Revision 7) of R.E.3.

Q1What changed115 changes

Annex 5 refers to M.R.1 for the “H” point procedure

A new footnote in Annex 5 says that Addendum 6 of Mutual Resolution No. 1 (M.R.1) describes the procedure. The footnote names document ECE/TRANS/WP.29/1101/Amend.5. The definitions, requirements and steps in Annex 5 to find the “H” point and the actual torso angle are deleted. Deleted paragraph 3.2.2. set tolerances: a 50 mm square around the “R” point and 5 degrees between the actual and design torso angle.

Purpose
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Text of Appendices 1 to 3 of Annex 5 deleted

Appendix 1 described the 3-D H machine, Appendix 2 the three-dimensional reference system and Appendix 3 the reference data for seating positions. The text of the three appendices is deleted. The new Annex 5 lists the three appendices by title only. Deleted footnotes referred to ISO Standard 6549-1980 for the 3-D H machine and ISO Standard 4130 for the reference system.

Appendix 1 - Description of the three dimensional "H" point machine
Appendix 2 - Three-dimensional reference system
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Distinguishing numbers of the Contracting Parties (para. 4.4.1., footnote 1)

Footnote 1 to paragraph 4.4.1. now says that the distinguishing numbers of the Contracting Parties are in Annex 3 to R.E.3. The footnote names document ECE/TRANS/WP.29/78/Rev.7. Before this supplement, the footnote listed the numbers from 1 for Germany to 46 for Ukraine.

1 for Germany, 2 for France, 3 for Italy, 4 for the Netherlands, 5 for Sweden, 6 for Belgium, 7 for Hungary, 8 for the Czech Republic, 9 for Spain, 10 for Yugoslavia, 11 for the United Kingdom, 12 for Austria, 13 for Luxembourg, 14 for Switzerland, 15 (vacant), 16 for Norway, 17 for Finland, 18 for Denmark, 19 for Romania, 20 for Poland, 21 for Portugal, 22 for the Russian Federation, 23 for Greece, 24 for Ireland, 25 for Croatia, 26 for Slovenia, 27 for Slovakia, 28 for Belarus, 29 for Estonia, 30 (vacant), 31 for Bosnia and Herzegovina, 32 for Latvia, 33 (vacant), 34 for Bulgaria, 35-36 (vacant), 37 for Turkey, 38-39 (vacant), 40 for The former Yugoslav Republic of Macedonia, 41 (vacant), 42 for the European Community (Approvals are granted by its Member States using their respective ECE symbol), 43 for Japan, 44 (vacant), 45 for Australia and 46 for Ukraine. Subsequent numbers shall be assigned to other countries in the chronological order in which they ratify or accede to the Agreement Concerning the Adoption of Uniform Technical Prescriptions for Wheeled Vehicles, Equipment and Parts which can be Fitted and/or be Used on Wheeled Vehicles and the Conditions for Reciprocal Recognition of Approvals Granted on the Basis of these Prescriptions, and the numbers thus assigned shall be communicated by the Secretary-General of the United Nations to the Contracting Parties to the Agreement.The distinguishing numbers of the Contracting Parties to the 1958 Agreement are reproduced in Annex 3 to the Consolidated Resolution on the Construction of Vehicles (R.E.3), document ECE/TRANS/WP.29/78/Rev.7, Annex 3 - https://unece.org/transport/vehicle-regulations/wp29/resolutions
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Q2Why it changed

Proposed by
Expert from the Netherlands
Working party
GRSP, 75th session (May 2024)

Reasons

  • The specifications of the three-dimensional “H”-point machine were updated and moved from R.E.3 to M.R.1.

    Source
    “The specifications of the three-dimensional "H" (3-D "H")-point machine have been updated and transferred from R.E.3. to M.R.1.”

  • A calibration procedure was added. It makes sure that the machine used for all tests in UN Regulations and UN GTRs gives consistent results.

    Source
    “Also, a calibration procedure was added, assuring that the 3-D "H"-point machine used for all testing in UN Regulations and UN Global Technical Regulations is consistent and gives consistent test results among all Regulations.”

  • The proposal updates references to the latest amendment (Revision 7) of R.E.3.

    Source
    “Update to latest amendment (revision 7) of Consolidated Resolution on the Construction of Vehicles (R.E.3).”

Document trail

  1. 2024-03ProposalECE/TRANS/WP.29/GRSP/2024/7Proposal by the expert from the Netherlands
  2. —RevisedGRSP-75-21Changed proposal that supersedes ECE/TRANS/WP.29/GRSP/2024/7
  3. —Working party adoptsECE/TRANS/WP.29/GRSP/75Session report, para. 30 and annex VII
  4. 2024-08Sent to WP.29ECE/TRANS/WP.29/2024/126Text that GRSP sent to WP.29 and AC.1
  5. 2024-11WP.29 adoptsECE/TRANS/WP.29/1181Adopted at the 194th session (session report, para. 158)
  6. 2025-06-12In forceC.N.297.2025.TREATIES-XI.B.16.21UN depositary notification

Q3Who is affected

Vehicle manufacturer

  • Determine the “H” point and the actual torso angle with the procedure in Addendum 6 of M.R.1.
  • Update the documents that quote the deleted text of Annex 5 or of its Appendices 1 to 3.

Component supplier

  • If you determine the “H” point of a seat, use the procedure in Addendum 6 of M.R.1.

Technical service / Approval authority

  • If your test procedures follow the deleted Annex 5 text, update them to Addendum 6 of M.R.1.
  • Compare the tolerances of the deleted paragraph 3.2.2. with the procedure in M.R.1 Addendum 6.
  • Use Annex 3 to R.E.3 (ECE/TRANS/WP.29/78/Rev.7) for the distinguishing numbers in the approval mark.

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

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