I agree totally with the point about the font size in the next turn box. It is way too small, especially for those spectacle wearers among us. It should take no more than 1/3 second to see exactly how far I have to go to my next turn but the font is way too small.
Glance down, peer, squint - look at the road for heaven's sake!!! Try again...but of course the distance has changed so even though I got an idea of the numbers the last time, now I am starting again. And I should be watching where I am riding. And then suddenly I'm on it and going too fast.
The road description and number at the top is almost irrelevant to me, the most important thing is which way do I turn and in what distance. That, for me (and everyone I ride with) is the single most important piece of information on the screen and it should be the largest piece of information and the most easily seen and understood.