Not a developer, so have to ask:
I see a need to create an app or legal non-jailbreak modification of Ios 10... that would display a heads-up mirror image of whichever app is in use on an Iphione screen. I use a street navigation app and hud display which does this, but it is too limited in functionality. For instance, using any of the map apps in hud mode would likely increase driver safety if the display is closer to the driver's normal line of sight. What do you think?