A heads-up display moves with your head; augmented reality moves with the world.
So, showing a billboard every 100m alongside the road showing your speed, heart rate, etc would be AR (and yes, a hud seems better option for this kind of thing)
I don’t see how that’s possible, it would have a prerendered map for a path like a game? use laser sensors to warn you of danger? I think it’s very possible on unnatural roads but on off-road it would not be useful.
In unnatural places can have markers that tell it to show you things, like how cars auto park, invisible signals could do it too, they could add haptics and it would be AR.
So, showing a billboard every 100m alongside the road showing your speed, heart rate, etc would be AR (and yes, a hud seems better option for this kind of thing)