29. The expert from Japan reiterated a proposal (ECE/TRANS/WP.29/GRSP/2023/34) on amending the requirement of the Thorax Compression Criterion (ThCC) of the 5th female dummy in vehicles of category N1 with a maximum permissible mass not exceeding 2,800 kg. The expert from Italy expressed concerns that the amendment would impact on the market of this vehicle category that was widely used for goods delivery. The expert from the Republic Korea informed GRSP that the proposal had received negative feedback in his country. The expert from OICA underlined that the proposal focused mainly on a national situation and not on those of other countries. The expert from the Netherlands proposed the possibility of establishing a two-step approach for implementing the proposed requirements for countries which needed them. GRSP noticed that this approach would potentially infringe on the principle of mutual recognition of type approvals of the 1958 Agreement. Finally, GRSP agreed to provide a further study reservation to the proposal and resume consideration on it at its May 2024 session.