The Informal Group of UN GRSP* has developed a new standard for approving child restraint systems in Europe, called I-Size regulation. Key objectives for developing this regulation were 1/reducing misuse rate through promoting ISOFIX restraint and 2/enhancing compatibility between cars and child restraint systems and 3/introducing a side impact test procedure.

The latter is the focus of this paper. The aim of the procedure is to reproduce – with an intruding door concept – the door relative velocity between the door and the struck vehicle. The objective of this study is to investigate the key features of this test procedure.

*GRSP:​ Working Party on Passive Safety, World Forum for Harmonization of Vehicle Regulations, UN Economic Commission for Europe.