Proposal as approved by the GRE to introduce flashing side marker lamps for vehicles of categories M2, M3, N2, N3, O3 and O4 with the objective of improving the safety of vulnerable road users by informing them about the intended turns of buses and heavy goods vehicles and their trailers. This document also makes editorial corrections and aligns UN R48 with UN R19 with regard to the prohibition of the simultaneous use of front fog lamps and other lamps with which the fog lamps are reciprocally incorporated.