Dude, you must drive only in long, lonely stretches of road.
In any urban driving condition, looking at your instruments long enough to gauge your acceleration by them is a good way to crash into something.
Knowing to the 50 meter increment where the next turn is isn't so helpful when there are multiple branching exits right next to each other. Being able to visually see at a glance where a turn is in relation to where your car presently is makes shit so much easier. No matter how good the audio is, it's not going to be easier than just seeing where you're supposed to go.
In the city, I don't really check my speed at all (or any instruments, really). The only time in an urban area I check is when I'm in a school zone or when I see a cop; otherwise no one cares if you're going 30 or 35 in a 25. It's intuitively obvious if you're going much faster or slower than that.
My car tells me "next left" or "second left" (and "onto streetname") in addition to distance. That seems ideal for most situations.
In any urban driving condition, looking at your instruments long enough to gauge your acceleration by them is a good way to crash into something.
Knowing to the 50 meter increment where the next turn is isn't so helpful when there are multiple branching exits right next to each other. Being able to visually see at a glance where a turn is in relation to where your car presently is makes shit so much easier. No matter how good the audio is, it's not going to be easier than just seeing where you're supposed to go.