17. The expert from France introduced GRSP-60-11-Rev.1 amending ECE/TRANS/WP.29/GRSP/2016/21 and ECE/TRANS/WP.29/GRSP/2016/24 as amended by GRSP-60-10. He added that both proposals introduced provisions for Phase 2 of Regulation No. 129 (see para. 13 above). He also explained that ECE/TRANS/WP.29/GRSP/2016/24 also aligned the 07 series with the 06 series of amendments to the Regulation. The expert from EC introduced GRSP-60-22, improving the provisions concerning contact of the head or of the chest with any rigid part of the vehicle (para. 6.4.1.4.1.2. of the Regulation). GRSP noted that the use of transitional provisions in supplements should be limited as much as possible and only in special cases as indicated by ECE/TRANS/WP.29/1044/Rev.1 (General Guidelines for UN Regulatory Procedures and Transitional Provisions in UN Regulations). Finally, GRSP adopted ECE/TRANS/WP.29/GRSP/2016/21 and ECE/TRANS/WP.29/GRSP/2016/24, as amended by Annex IV to the session report. The secretariat was requested to submit: (i) ECE/TRANS/WP.29/GRSP/2016/21 as draft Supplement 9 to the 06 series of amendments and (ii) ECE/TRANS/WP.29/GRSP/2016/24 as draft Supplement 1 to the 07 series of amendments to Regulation No. 16, for consideration and vote at the June 2017 sessions of WP.29 and AC.1.