Proposal to align UN R78 with the latest amendments to UN R13-H regarding the deceleration thresholds for the activation of the stop lamp(s) under regenerative braking and to introduce a reference to the new American Society for Testing and Materials (ASTM) Standard Reference Test Tyre F2493.
96. The expert from IMMA introduced GRVA-11-22, modifying ECE/TRANS/WP.29/GRVA/2021/26, with amendments to the stop lamp activation criteria He proposed that GRVA would harmonise stop lamp activation thresholds for regenerative braking in UN Regulation No. 78 with new provisions in UN Regulation No. 13-H.
97. The expert from Japan stated that the proposal can be supported. He noted however that automatically commanded braking was not considered in the current text of UN Regulation No. 78. He added that, if automatically commanded braking would be introduced in UN Regulation No. 78, then consistency between UN Regulation No. 78 and UN Regulation No. 13-H would be needed.
98. The expert from IMMA also presented ECE/TRANS/WP.29/GRVA/2021/27, proposing reference updates to standards that were recently revised.
99. GRVA adopted ECE/TRANS/WP.29/GRVA/2021/26 as amended by GRVA-11-22 (as reproduced in Annex V of the session report) and ECE/TRANS/WP.29/GRVA/2021/27. GRVA requested the secretariat to submit them as draft supplement to UN Regulation No. 78 to WP.29 and AC.1 for consideration and vote at their March 2022 sessions.
| GRVA/2021/26 | |
| GRVA/2021/27 | |
| GRVA-11-22 |