UN R138 Supplement 3 (01 series) · UNECE Regulation No. 138 (ECE R138) — Uniform provisions concerning the approval of Quiet Road Transport Vehicles with regard to their reduced audibility.
UN R138 — Supplement 3 to the 01 series of amendments
Supplement 2 → 3
- What changed
- For the measurement of vehicles in motion, the test track construction and surface must now meet the requirements of ISO 10844:2021 instead of ISO 10844:2014.
- Annex 3, paragraph 2.1.2. now refers to ISO 10844:2021 in place of ISO 10844:2014 in two places.
- New paragraph 11.9. accepts ISO 10844:2014 for all approvals until five years from the entry into force of Supplement 3.
- Why
- The proposal brings the latest ISO 10844 standard test surface into the Regulation.
- ISO updated the ISO 10844 standard to improve clarity, and the primary objective is to reduce track-to-track variability.
Q1What changed3 changes
ISO 10844:2021 in place of ISO 10844:2014 (Annex 3, para. 2.1.2.)
For the measurement of vehicles in motion, the test track construction and surface must meet the requirements of ISO 10844:2021. Annex 3, paragraph 2.1.2. now refers to ISO 10844:2021 in place of ISO 10844:2014 in two places.
Acceptance of ISO 10844:2021 and ISO 10844:2014 (para. 11.9.)
New paragraph 11.9. says that, from the entry into force of Supplement 3, ISO 10844:2021 must be accepted for all approvals granted under this Regulation. Until five years from the entry into force of Supplement 3, ISO 10844:2014 must be accepted for all approvals granted under this Regulation.
Q2Why it changed
- Proposed by
- International Organization for Standardization (ISO)
- Working party
- GRBP, 76th session (September 2022)
Reasons
The proposal brings the latest ISO 10844 standard test surface into the Regulation.
Sources (2)
“to bring the latest ISO 10844 standard test surface into the Regulation”
“The expert from ISO proposed to bring the latest ISO 10844:2021 standard test surface into UN Regulation No. 138”
ISO updated the ISO 10844 standard to improve clarity. The primary objective is to reduce track-to-track variability caused by differing interpretations and implementations of the technical requirements.
Source
“ISO has updated the 10844 standard to improve clarity. The primary objective is to reduce track-to-track variability caused by differing interpretations and implementations of the technical requirements.”
ISO 10844:2021 also has other improvements. For example, it permits more modern and accurate methods of measurement of irregularity, such as laser methods, in addition to straightedge. It also replaces the sieving curve figure with an equivalent tabulation of sieve values.
Sources (3)
“The following table includes other improvements that have been made.”
“Permit more modern and accurate methods of measurement (e.g. laser methods) in addition to straightedge”
“Replace sieving curve figure with equivalent tabulation of sieve values defining an aggregate grading envelope”
Document trail
- 2022-06ProposalECE/TRANS/WP.29/GRBP/2022/15Proposal by ISO
- —Working party adoptsECE/TRANS/WP.29/GRBP/74GRBP session report, para. 11
- 2022-12Sent to WP.29ECE/TRANS/WP.29/2023/3Text that GRBP sent to WP.29 and AC.1
- 2023-03WP.29 adoptsECE/TRANS/WP.29/1171Adopted at the 189th session (session report, para. 127)
- 2023-09-24In forceC.N.428.2023.TREATIES-XI.B.16.138UN depositary notification
Q3Who is affected
Vehicle manufacturer
- Plan approvals that use an ISO 10844:2014 test track within five years from the entry into force of Supplement 3.
Component supplier
- No direct action for this role.
Technical service / Approval authority
- Check the test track for vehicles in motion against ISO 10844:2021, or ISO 10844:2014 within the period of paragraph 11.9.
- Plan to have an ISO 10844:2021 test track before the five-year period in paragraph 11.9. ends.
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ⓘ This report gives advice only. It is not legal or type-approval advice.