45. GRSG resumed discussion on the proposal of CLCCR on assisting driven axles of trailers (ECE/TRANS/WP.29/GRSG/2023/5). The expert from Germany mentioned GRSG-127-01 and explained that the investigation of the Federal Highway Research Institute (BASt) of Germany had been presented at the October 2023 session of GRSG. He added that the current definition of trailers need not be changed if the trailers lacked a driving force. The expert from the Netherlands reminded GRSG that the issue should be dealt with differently in working groups. He announced that a revised proposal was prepared by CLCCR, France and the Netherlands for the upcoming GRSP that addresses UN Regulation No. 100 (Electric power trained vehicles). He clarified that the proposal would also consider the trailer as a generator of electricity in a first stage and possible traction to compensate for internal losses in a second stage. The OICA expert endorsed the statement from the expert from the Netherlands and informed GRSG that a proposal addressing this kind of trailer was under discussion in GRVA. The expert from China informed GRSG that in his country, studies had been developed and research made on this subject. GRSG agreed to resume discussion on this subject at its October 2024 session.