What about the idea for non-car-drivers?
I don't drive I bike and to keep flies and debris out of my eyes I am always with cycling glasses on (usually clear) and what I do is use an Android Wear watch and the Anker IE20 buds magnetically around my neck to be kept informed and control where my hands are significantly tied up with the act of biking. For example at traffic lights I'll hold the watch right up ahead with the red light just above the watch and then read emails etc waiting for green light. If someone is ringing I can see name/number on my wrist and swipe to answer then put one or both of the buds in my ear.
Would be a cool gadget if this were the Google Glass concept of something I can see and process off my cycling glasses, a HUD for cyclists.
With congestion and type-2 diabetes growing more are returning to cycling.
If you made such a HUD for cyclist you can then basically wear these when in a car and it there in front of your vision no matter which way your head is pointing, so in some ways better than built ontop of the dashboard. For use in a car it could pair with car specific items?
Note: Android Wear significant drains mobile phone batteries so why I'm always with some kind of charging solution, usually the Anker Powercore Slim because it slips into pockets/pouches easily.