For added safety, the new R48 - revision 6 stipulates that on a trailer longer than 9 m (and on a selection of transport vehicles) the side marker lamps must flash at the same frequency as the direction indicator lamps (source : https://www.unece.org/). Vignal offers two solutions to respect this regulation: the management of the flashing side marker lamps by our LC12 LED taillight or by our SMCU (side marker control unit).