The same can be said of self-parking cars, though, where as far as I know, the driver is still responsible. It's just another convenience. If you want to slack off and read a book while driving, sure, but IF you crash, then you're responsible for letting it happen. In the red light case, any driver should be able to detect that the car is not braking and override the autopilot. If you want to read a book then take the train/bus, at least for the foreseeable future.
I'm just saying that this is likely what will be required to begin with, until these systems have a proven track record, at which point the manufacturer could potentially license their system for completely autonomous driving, and the manufacturer at that point would have to be somehow responsible if the system causes an accident. (Which should be relatively easy to prove, any self-driving car would likely have to keep logs of their actions)