33. The expert from Spain, on behalf of IWG on safer transport of children in buses and coaches informed GRSP about the progress of the group (GRSP-68-03). She explained that the group was examining different configurations of testing (e.g.: seating position, Q dummies with or without CRS, types of CRS) considering bus requirements (UN Regulations No. 80 and 107). She explained that the group was aiming at having a proposal by the December 2022 session of GRSP. The expert from the Russian Federation would like to propose to use the impulse mentioned in UN Regulations Nos. 44 and 129 for the frontal impact for vehicles of category M2 since these vehicles have lower mass compared to M3. For the M3 category of vehicles, the Russian Federation proposed to use the impulse used in UN regulation No. 80. The EC representative explained that a study was currently underway in the European Union focusing on appropriate crash test pulses through all vehicle categories and direction of impacts. He announced that he likely would present the outcome of the study at the May 2021 session of GRSP. GRSP agreed to resume discussion on this subject at its May 2021 session.