Sweeping indicators use smart technology, found in both headlights and taillights, to improve the functionality of turn indicators by sending clearer signals than conventional turn signals.
They’re implemented on each side by a band of 30 LEDs, with seven segments sequentially activated every 150 milliseconds. As turn signal flashers, they illuminate on the same side as the direction that the driver intends to turn.
Article source: www.audi.co.uk