31. The expert from Spain, on behalf of IWG on safer transport of children in buses and coaches informed GRSP on the progress (GRSP-70-02). She confirmed that the group was examining different configurations of testing and Child Restraint Systems (CRS) fittings in M3 (e.g. seating position, Q dummies with or without CRS, types of CRS) considering bus requirements. She also confirmed that built-in CRS had been considered but their use as a solution could conflict with structural modification of buses. GRSP agreed to resume consideration on this subject at its May 2022 session.