I see from Keith’s post above that it’s called “functional piggybacking”.... The indicators and DRL’s share the same lamp. The bulbs used have some clever integrated electronics to enable the DLR's to remain always on until the indicators are activated and then the bulb changes to flashing orange. When the indicator is cancelled the DRL slowly phases back to white. They are also deactivated when the main lights are switched on as they are too bright for night use.
Well that is very clever and very neat to look at.
