Proposal to limit the scope of UN R135 to M1 vehicles under 3.5 t maximum vehicle mass and to certain N1 vehicles based on geometric measurements. The proposal would exclude the small number of M1 vehicles weighing in excess of 3.5t that are based on N2, N3, M2, or M3 platforms. [Because the transitional provisions of the 01 series of amendments to UN R135 stipulate an effective date of 1 September 2016, this supplement to the 01 series will remain pending until after that date. Although adopted, the supplement cannot become enter into force prior to the effective date of the regulation it modifies.]