I rented a car recently for a trip to Arizona that had lane keeping on by default. The highway I was traveling on was undergoing extensive repair. Not only did the car sound audible alarms with some frequency, since the highway had been rerouted in places using traffic cones, it also constantly tried to veer the car back into “the lane.” Since the lane was in some places just a hole, the consequences would have been bad. I ended up pulling over and fishing through the menus until I found a way to turn it all off.

It appears that there’s a very long tail of exceptional circumstances that must be handled with autonomous driving.