Proposal to amend para. 2.9. to define “ISOFIX position” as one that satisfies requirements of this Regulation to allow installation of ISOFIX child restraint systems as defined in UN R44 and UN R129, amend para. 2.24. to define “i-Size seating position” as one that satisfies requirements of this Regulation to allow installation of i-Size child restraint systems as defined in UN Regulation No. 129, amend para. 5.2.2.7. to exclude low ISOFIX anchorages installed in vehicles of category M₂ or M₃ from certain requirements, amend para. 5.2.4.1. to exclude vehicles of category M₂ and M₃ from marking requirements, and amend para. 6.2.5.1. to establish differentiated seat inertia forces for vehicles of categories M₂, N₂, M₃, and N₃. The justification clarifies that the definitions are based on tests fulfilled in this Regulation regarding strength rather than CRS category, addresses that the prior ISOFIX position definition incorrectly allowed i-Size CRS installation in non-i-Size positions, and harmonizes inertia loads for M₂ and M₃ vehicles with UN R14.