Proposal to insert definitions for Child Restraint System, ISOFIX position, and i-Size seating position, add requirements for installation of child restraint systems in vehicles of categories M₂ and M₃ including pictogram markings for ISOFIX positions, i-Size seating positions, and rearward-facing passenger seats, and establish transitional provisions. Contracting Parties applying this Regulation shall not be obliged to accept type approvals to preceding series first issued after 1 September 2030.