I typically have the voice turned off because of this issue but I do enjoy the variety of voices offered and I have noticed in a lot of city driving the turn notifications are too frequent.

For example if I'm making a left at an intersection then turning right in 3/4 mile into a neighborhood I hear:
turn left, in 3/4 miles turn right, in a half mile turn right, in 1/4 mile turn right, turn right.

I would like to have a feature where I can toggle these options off or limit it to only give me x amount of turn notifications per minute. Because of this its nearly impossible to listen to music because your constantly being blasted with repetitive and unnecessary turn notifications.