Cars that drive themselves?

Ever wonder what it would be like just to sit in your car and not have to drive? Well it is estimated that within the next 20 years, this will be possible. We are getting close in technology where all you will have to do is put your key in the ignition and press the address of where you want to go, and the car will drive there on its own. This brings up the concern if it is safe, they would have to install wires in the roads in order for this to happen, what if something goes wrong with the one of the wires in the middle of driving? What happens as far as shifting lanes and the people who do not get these cars, yet drive on their own still? This article says that with this new technology, accident rates will go down, I am not so sure if I agree. What are your thoughts?