I have seen a few augmented reality windshields for vehicles in my life. Best one I saw was from @WayRay which had a film that was stuck to the inside of the windshield which, when sprayed with laser light, generated a hologram (3D image) over the road in front of you. The problem is it costs and weighs a few pounds in dashboard. That said, the use case is an interesting one, even if I expect that any Apple vehicle will be driving you like my Tesla did to us tonight. The real problem is that what's more important? A cool screen on the road ahead or a car that can self drive? I can tell you for myself it isn't even close. Self driving is way way way way more important to me and the consumers I study.