I just can't imagine relying on something like that for my safety. I have worked on GPS and IoT solutions in related spaces and the comms networks aren't reliable, and actual control of a consumer vehicle is about the last thing I would ever want relying on it.

I think if I might be critical, the idea that the car graciously hands over control to you at a moment you are capable of catching might be a bit of a blind spot. The car could lose one of the signals it needs at an inopportune time and you would need a split second and correct emergency reaction to not spear off the road or collide with something. The physics of cars at highway speeds is awe inspiring, problems happen really, really fast.

Sure; I think that's a reasonable take too. I have no idea what their TTL requirements are or how frequently they update the ADAS database; if they're on the order of real-time, this seems like a complete technical constraint, if they're on a longer time horizon they might be able to offer manual offline databases.

I'm very curious at what level the restrictions operate. With every other manufacturer I've looked at, they're extremely coarse-grained; it's more like "is there a known long-time-horizon hazard in this area that is known to impair the system" than a "we mapped every lane and you need a database." I wonder if your I5 issue was a weeks or months-old construction area, for example. I haven't looked at Rivian much, though, and it could be totally different or extremely fine grained, there's no reason to suggest otherwise either.

Can LIDAR see lane markings? I would have thought that was computer vision only.

I think it's a coarse-grained "this highway has been deemed non-anomalous enough to allow the vision systems to engage," not a fine-grained "we mapped every lane marking."