Give the user the option to turn-on "vibrate notifications" in addition to voice. Many times when driving I am distracted talking to a passenger or listening to the radio and miss a turn.
It would be great if my phone would also vibrate. I would like to have this option for police notifications as well.
If this were an option, then those that don't want vibrate notifications don't have to use it.
And vibrate a smartwatch too!
This would be a great feature for motorcyclists who can't always keep an eye on the screen and may not hear the verbal instruction.