The proposal by Belgium GRSG/2016/05 aimed at removing the amended additional safety prescriptions for trolleybuses from annex 12 of UN Regulation No. 107 for the Construction of M2 and M3 vehicles (R107), and inserting them into UN Regulation No. 100 on Electric Powertrain Vehicles (R100), see proposal GRSP/2016/07. This document explains how the scope and technical provisions for trolleybuses of R100 and R107 are complementary, but not yet fully compatible.