It would be extremely annoying and dangerous for many years, whatever system was brought into place. There would be computer errors, loopholes that nefarious characters could exploit to cause chaos, malfunctions causing accidents. New systems of any kind have their glitches and require a human to be there should the shit hit the fan. I doubt we'll ever be able to drive around out of our faces on drink or drugs and accept no responsibility for what the car is doing. The most likely method I can think of is multiple cameras attached to the car and some very beefy computers inside that would process the input. RFID and GPS would compliment this, but play a secondary role. There are too many variables not to use cameras and sensors. A pedestrian could walk into the road and your auto-car would keep going, or drive straight over the log that's fallen off a truck. Personally, I'd rather be in control. At least if I screw it up it's my own fault. I agree with Toyota's (think it's toyota) assisted parallel parking system. A lot of people are utterly useless at parallel parking and it would speed things up for everyone. I'd be doing it manually, though. I'm perfectly capable of driving and I don't want to pay for sophisticated computers and equipment I have no intention to use.