FWIW (in regard to how loud that blinker is!). I just learned today that the blinking noise is computer generated.
Had a weird glitch today where the blinking noise went haywire (multiple rapid blinking noises) and then the blinker, the radio and proximity warning tones glitched out and wouldn't play. Amazing how quiet the car is, it was kind of freaky. Car drove fine and I could tell from the little car icon on the dash that the blinkers were working fine.
Rebooted when I had a chance, and all was fine after that.