Clarification that the proposal to exclude multi-layer glazed windows from the head impact requirements of UN R43 does not directly relate to the work or recommendations of the Informal Group on Plastic Glazing.

20. The expert from Hungary presented GRSG-109-10 justifying the amendments to UN Regulation No. 43, proposed in ECE/TRANS/WP.29/GRSG/2015/4 and aimed at clarifying the use of thick glass panes for multiple glazed units. He especially wondered why the headform test was applicable for multiple glazing, but not necessarily for single pans. The expert from Germany explained that the mechanical properties of single pans of safety glazing were different than those of multiple-glazed pans and, therefore, the single pans did not necessarily need to be tested for critical values in case of head impacts. Following the discussion, GRSG agreed to remove ECE/TRANS/WP.29/GRSG/2015/4 from its agenda.

Proposal to define a reduced vision zone I for vehicles of categories M and N other than M₁.

18. The expert from CLEPA introduced ECE/TRANS/WP.29/GRSG/2015/3 proposing to define a reduced vision zone I for vehicles of categories M and N other than M1. GRSG noted a number of study reservations on the proposal with respect to the impact of the proposed provisions for some categories of vehicles. The Chair invited all experts to send their comments to the expert from CLEPA and to resume consideration of this subject at the next GRSG session on the basis of a revised document by CLEPA.

19. Recalling the discussion on ECE/TRANS/WP.29/GRSG/2015/3 at the previous GRSG session, the expert from CLEPA announced his intention to submit, jointly with OICA and for consideration at the next GRSG session, a revised set of provisions for a well-defined vision zone of vehicles of categories M and N other than M1, aimed at allowing a better transmission of electromagnetic signals.

13. The expert from CLEPA withdrew ECE/TRANS/WP.29/GRSG/2015/3.

This proposal aims to enable the use of thick glass panes for multiple glazed units which, in turn, requires exempting such configurations from the head-form test.

19. The expert from Hungary proposed an amendment to the UN Regulation allowing the use of thick glass panes for multiple glazed units (ECE/TRANS/WP.29/GRSG/2015/4). GRSG noted some comments. The document did not receive the full support of GRSG. It was agreed to keep ECE/TRANS/WP.29/GRSG/2015/4 on the agenda and to have a final review of the proposal at the next session of GRSG.

20. The expert from Hungary presented GRSG-109-10 justifying the amendments to UN Regulation No. 43, proposed in ECE/TRANS/WP.29/GRSG/2015/4 and aimed at clarifying the use of thick glass panes for multiple glazed units. He especially wondered why the headform test was applicable for multiple glazing, but not necessarily for single pans. The expert from Germany explained that the mechanical properties of single pans of safety glazing were different than those of multiple-glazed pans and, therefore, the single pans did not necessarily need to be tested for critical values in case of head impacts. Following the discussion, GRSG agreed to remove ECE/TRANS/WP.29/GRSG/2015/4 from its agenda.

Proposal to clarify the specification of the abrasion test machine.

21. Referring to the discussion at the previous session of GRSG, the expert from Hungary introduced ECE/TRANS/WP.29/GRSG/2015/22 clarifying the requirements on the abrasion test machine. The experts from Germany informed GRSG about the status of work in ISO and announced that the corresponding ISO standard was in the process of being finalized and would hopefully be published by the end of the year. GRSG agreed to resume consideration of ECE/TRANS/WP.29/GRSG/2015/22 at its next session in April 2016.

14. The expert from Hungary introduced ECE/TRANS/WP.29/GRSG/2015/22 clarifying the technical requirements on the abrasion test machine. The expert from Germany informed GRSG about the status of work in ISO on abrasion test machines. He expected that the corresponding ISO standard would hopefully be published by the end of 2016. GRSG agreed to resume consideration of ECE/TRANS/WP.29/GRSG/2015/22 at its next session in October 2016, awaiting the publication of the ISO standard.

15. The expert from Hungary presented ECE/TRANS/WP.29/GRSG/2015/22 on clarifying the technical requirements of the abrasion test machine. The expert from Poland suggested replacing figure 4 in Annex 3 with a diagram including dimensions (GRSG-111-05). The expert from Germany informed GRSG that the corresponding ISO standard would be published soon. He offered to update the document to fully align the provisions of the Regulation with those of the ISO standard. GRSG welcomed that offer and agreed to defer the adoption of the amendments to UN Regulation No. 43 to its next session in April 2017 awaiting the submission of a revised official document by Germany.