52. The expert from OICA introduced GRVA-02-25, proposing clarifications of the requirements regarding the generation of a brake signal to illuminate the stop lamp especially in the context of hybrid electric and battery electric vehicles. The proposal received some comments. GRVA invited the expert from OICA to submit a revised proposal for review at the September 2019 session of GRVA.

53. The expert from OICA presented GRVA-01-27 proposing an alternative approach for conducting the Type II-A test (defined in UN Regulation No. 13) for battery electric vehicles (also including hybrid electric vehicles). He highlighted the economic burden on manufacturers producing battery electric vehicles of category M3 (Classes II, II and B) as well as N3 (for the carriage of dangerous goods and those towing trailers of Category O4). GRVA agreed to discuss this issue but expressed reservations with the idea presented because of the high safety risk related to the situation of such vehicle driving downhill with a full state of charge of the traction battery. The expert from Czech Republic reported on their experience with city buses equipped with battery electric vehicles. GRVA agreed that more information including statistics on the battery state of charge, effect on aftermarket replacement parts, details on the working principle of the proposed “brake estimator” would be needed in order to further discuss this matter.