A coworker in Austin had a Subaru with the EyeSight system, and it would hard-brake on RM-2222 when it saw the rock walls in a curve. Presumably the "obstacle" took precedence over the fact that the road was curving. She pretty much had to stop using the system on her commute.
https://goo.gl/maps/BdzW5Y1aQdFNKKSt6
GM's Super Cruise system looks impressive (caveat: I haven't tried it out yet). But I'm not sure they have the funds and corporate will to create the LIDAR maps of the US road system that are needed for full coverage.
https://www.cadillac.com/ownership/vehicle-technology/super-...