22. The expert from IMMA introduced GRRF-86-35 with provisions allowing additional conditions for the activation of the stop lamp. The proposal received some comments. GRRF noted that some conditions were related to regenerative braking and, therefore, GRRF recommended to explore corresponding provisions in UN Regulations Nos. 13 and 13-H on the braking performance of regenerative braking and to complement the proposal for amendments to UN Regulation No. 78 with corresponding provision, not only addressing brake light activation requirements. GRRF noted the potential need to clarify the need of the word “instantaneous” in para. 5.1.16. The expert from IMMA agreed to submit a revised proposal for the September 2018 session of GRRF.

51. The expert from IMMA introduced GRVA-01-42 as a follow-up proposal of
GRRF-86-35 aiming to specify the stop lamp activation criteria for conditions other than only on application of the service brake (e.g. regenerative braking). She explained that the proposal is based on the provisions laid down in UN Regulation No.13-H. The expert of OICA mentioned that they were working on amendments to these criteria. GRVA encouraged the experts from IMMA and OICA to come up with harmonized provisions for UN Regulations Nos. 78 and 13-H and requested the secretariat to distribute the proposal with an official symbol at the next session of GRVA unless an alternative proposal would be submitted by the experts from CLEPA and OICA.

55. The expert from IMMA presented ECE/TRANS/WP.29/GRVA/2019/7, introducing revised provisions on the stop lamps activation under more conditions than the application of the service brake only (e.g. regenerative braking). GRVA adopted the proposal as amended and reproduced in Annex VI to the report. GRVA requested the secretariat to submit Annex VI to WP.29 and AC.1 as draft Supplement 1 to the 04 series of amendments to UN Regulation No. 78 for consideration and vote at their June 2019 sessions.