Precisely. I've long wanted to build a HUD that could project on all the glass surfaces of my car. If I were building a HUD, it should be giving me a "heads up."
The windshield would have navigational aids, but any surface in the car could be used to display hazards!
I want my car to identify if a pedestrian is present (highlighted in yellow) or if they appear to be crossing my heading (highlighted in red.)
I want my car to tell me if there is cross-traffic that is about to run a red light. I'd like to see speed and distance indicators for other vehicles on the road.
I'd love to see the speed of traffic I'm merging into. When I glance over my shoulder to check traffic I can see: !! 64MPH | 72MPH !! in yellow, indicating I should merge faster if I'm able.
If my car detects emergency vehicles or construction vehicles the HUD could draw attention to it in my windows or mirrors.
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Perhaps my HUD could identify vehicles occupied by "Tweeters" so I can be sure to avoid them?
We're making self-driving cars... there are countless ways to apply that same technology to human-driven cars that would make the roads safer for everyone. If the best they can come up with is song selection and social media: I think their priorities are a bit misaligned.