4. The expert from Germany introduced GRSG-128-27 on behalf of the Chair of the IWG on Safer Transport of Children in Buses and Coaches (STCBC). He informed GRSG about the IWG progress in Phase 2. He clarified that IWG work would aim to prevent the ejection of children and would improve the vehicle retention systems already on the market. He mentioned the issue of use of CRS type approved according to UN Regulation No. 44 and UN Regulation No. 129 also approved according to UN Regulation No. 170 for use in buses in combination with a 2-point belt. Moreover, he also highlighted that a digital certificate would be needed to verify, that a CRS approved according to UN Regulation No. 129 was without any modification also approved according to UN Regulation No. 170 for the use with 2-point belts in buses and coaches. GRSG, agreed to put this subject in the highlights of the session of the GRSG Chair who would seek guidance from WP.29 at its November session.