Would it be possible to add in any TTS indication a TA/TP code from RDS that would not be eared but would be recognized on a FM transmitter that would allow to automatically switch from the listened FM station to the Waze info and then go back to the FM station.
I don't know how it works with RDS but it would be good to investigate on it That would give another marketing advantage for all the people who use FM transmitters on their cars.
I hope it's clear (not sure), if you have questions do not hesitate.
Regards