GRSP/2026/2
UN R129: Proposal for a Supplement 5 to the 04 series and a Supplement 1 to the 05 series of amendments
Source(s)
Date
19 Mar 2026
Status
Formal GR review
Subject
Impact
04 series of amendments | Supplement 5
05 series of amendments | Supplement 1
Meeting(s)

Proposal to amend UN Regulation No. 129 to remove rebound head contact from the head acceleration requirement for all Child Restraint Systems. The regulation currently lacks consistency regarding whether rebound head movement is considered in testing. Variations in test bench design cause booster seats to pass in some laboratories but fail in others based solely on rebound contact. The proposal ensures consistency between different CRS types and reproducibility across laboratories with different test bench designs, and aligns with the approach in UN Regulations 94 and 137.

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