I have a SEAT Leon Mk3 FR 1.8 TSI DSG with full LED headlights and the Media System Plus/Navi System. Does anyone know what the "Lane change flash" option in the Light assistance submenu of the Light setup menu means or does? I cannot find any reference to this option in either of my SEAT Leon manuals. I have this option ticked but still cannot work out what it actually does. The Media System hardware version is 040 and the software version is 0421. 