UN R129 Supplement 3 (04 series) · UNECE Regulation No. 129 (ECE R129) — Uniform provisions concerning the approval of Enhanced Child Restraint Systems used on board of motor vehicles (ECRS).
UN R129 — Supplement 3 to the 04 series of amendments
Supplement 2 → 3
- What changed
- Paragraph 3.5 now says “more than one UN Regulation No. 129 approval number” where it said “more than one approval number”.
- Paragraph 5.2. adds that a type of Enhanced Child Restraint System approved according to this Regulation can bear a UN Regulation No. 170 approval mark.
- Paragraph 5.2. deletes the words “(at present 04 corresponding to the 04 series of amendments)”.
- Why
- The entry into force of UN Regulation No. 170 makes it necessary to coordinate type-approval number requirements under UN Regulations Nos. 129 and 170.
- The amended paragraph 3.5 clarifies its original intention and allows for a second approval number according to UN Regulation No. 170.
Q1What changed3 changes
UN Regulation No. 129 approval number and UN Regulation No. 170 approval mark (paras. 3.5 and 5.2.)
Paragraph 3.5 now says that an ECRS must not bear more than one UN Regulation No. 129 approval number. Before this supplement, it said “more than one approval number”, without the Regulation number. This provision does not apply for the purpose of approving a module as part of different ECRSs. Paragraph 5.2. adds that a type of Enhanced Child Restraint System approved according to this Regulation can bear a UN Regulation No. 170 approval mark. Paragraph 5.2. also says that such a type must not bear another approval mark according to UN Regulation No. 44 (Child Restraint Systems).
First two digits of the approval number (para. 5.2.)
Paragraph 5.2. says that the first two digits of the approval number must indicate a series of amendments. This is the series incorporating the most recent major technical amendments made to this Regulation at the time of issue of the approval. The amendment deletes the words “(at present 04 corresponding to the 04 series of amendments)” from this sentence.
Q2Why it changed
- Proposed by
- Informal Working Group on the Safe Transport of Children in Buses
- Working party
- GRSP, 76th session (December 2024)
Reasons
UN Regulation No. 170 sets out requirements for the safe transport of children in buses and coaches. Its entry into force makes it necessary to coordinate the requirements for issuing type-approval numbers under UN Regulations Nos. 129 and 170.
Sources (2)
“The entry into force of UN Regulation No. 170, which sets out requirements for the safe transport of children in buses and coaches”
“makes it necessary to coordinate the requirements for issuing type-approval numbers according to UN Regulation No. 129 and UN Regulation No. 170.”
UN Regulation No. 129 covers ECRS for use in vehicles of categories M1/N1, M2/N2 and M3/N3. This is provided that the vehicle's seats can accommodate them and that they are installed with either ISOFIX or 3-point seat belts. Installation with a 2-point seat belt is prohibited.
Sources (2)
“UN Regulation No. 129 covers ECRS for use in the M1/N1, M2/N2 and M3/N3 categories of vehicles”
“provided that the vehicle’s seats can accommodate them and that they are installed with either ISOFIX or 3-point seat belts. Installation with a 2-point seat belt is prohibited.”
UN Regulation No. 170 covers built-in CRSs. It also covers ECRS approved in accordance with UN Regulation No. 129 (phase 1). In phase 2, it covers CRSs installed with a 2-point seat belt in (M2 and) M3 category vehicles.
Sources (3)
“UN Regulation No. 170 covers:”
“ECRS approved accordance with UN Regulation No. 129 (phase 1), and”
“CRSs installed with a 2-point seat belt in (M2 and) M3 category vehicles (phase 2)”
Paragraph 3.5 was introduced in Supplement 10 to avoid multiple UN Regulation No. 129 approval numbers on one ECRS. The amended text clarifies the original intention and allows for a second approval number according to UN Regulation No. 170.
Sources (2)
“Paragraph 3.5 was introduced in Supplement 10 to avoid multiple UN Regulation No. 129 approval numbers on one ECRS.”
“The amended text clarifies the original intention and allows for a second approval number according to UN Regulation No. 170.”
GRSP's report says the documents clarify the number of permitted marks on enhanced child restraint systems under UN Regulations Nos. 129 and 170.
Source
“These documents introduce clarifications into UN Regulation No. 129 regarding the number of permitted marks on enhanced child restraint systems according to UN Regulations Nos. 129 and 170.”
Document trail
- 2024-09ProposalECE/TRANS/WP.29/GRSP/2024/20Proposal by the Informal Working Group on the Safe Transport of Children in Buses
- —RevisedGRSP-76-24Informal document that superseded ECE/TRANS/WP.29/GRSP/2024/20
- —Working party adoptsECE/TRANS/WP.29/GRSP/76Session report, para. 28
- 2025-04Sent to WP.29ECE/TRANS/WP.29/2025/52Text that GRSP sent to WP.29 and AC.1
- 2025-06WP.29 adoptsECE/TRANS/WP.29/1186Adopted at the 196th session (session report, para. 111)
- 2026-01-11In forceC.N.37.2026.TREATIES-XI.B.16.129UN depositary notification
Q3Who is affected
Vehicle manufacturer
- No direct action for this role.
Component supplier
- Check whether your Enhanced Child Restraint System types will also bear an approval mark according to UN Regulation No. 170.
Technical service / Approval authority
- Be ready for Enhanced Child Restraint System types that also bear an approval mark according to UN Regulation No. 170.
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ⓘ This report gives advice only. It is not legal or type-approval advice.
More UN R129 change reports
- 05 series — Supplement 1
- 05 series — Base text
- 04 series — Supplement 6
- 04 series — Supplement 5
- 04 series — Supplement 4
- 04 series — Supplement 2
- 04 series — Supplement 1
- 04 series — Base text
- 03 series — Supplement 12
- 03 series — Supplement 11
- 03 series — Supplement 10
- 03 series — Supplement 9
- 03 series — Supplement 8
- 03 series — Supplement 7
- 03 series — Supplement 6
- 03 series — Supplement 5