Originally Posted by Mike_L
They're legal. I have amber on my 750 and have had them on numerous other cars.
There's a thread about this (the one with the necessary re-programming I think) and if memory serves, while it's legal to have Amber turn signals, Audi's implementation isn't NHTSA-approved (aka legal).
I totally agree it's hellaciously stupid! My C5 had red, later C5s got amber, all a serious WTF in my book. NHTSA and lighting is ridiculous!