As a driver of a car with these systems (Audi, having a 'Lane assist' and 'ACC'): The implementation is absolutely crushingly useless, every day. Lane assist k

As a driver of a car with these systems (Audi, having a 'Lane assist' and 'ACC'): The implementation is absolutely crushingly useless, every day. Lane assist kinda, sorta works (I can choose if the car will actively try to stay in the lane and/or if it's going to alarm me by vibrating the steering wheel when I cross over into another lane). It's limited to the Autobahn though and really more often then not just doesn't recognizes the lanes. IF it does, it has the kind of protection you describe. Unfortunately that makes it even less useful. On a really straight road I cannot turn it on, because it's going to beep at me after 1-2 seconds. You need to drive (I exaggerate, but the idea's true) like in a Hollywood movie from the 60s (or the Simpsons intro), turning the wheel left and right for no reason. (The ACC in this car is crap as well, but .. let's leave it with lane assist for now) I am extremely skeptical that this system can work, in general, any time soon. Even in a Tesla.