All they need to do now is put this into cars and all we need to do is put the engine on and go. All you'd do is sit there so motorway cops don't need to do anything. stuff would get boring.
The technology already exists to put these systems into cars, infact it's already been done.
The issue isn't with the technology, it's with people. People don't like to be out of control, especially when it comes to vehicles, they prefer to have manual control.
For systems like these to be implemented fully then we need to take baby steps such as self-parking cars which do already exist and are in use. Ease the technology in easy, that gives both humans and the technology time to adjust and advance.
http://gigaom.com/mobile/ford-is-ready-for-the-autonomous-car-are-drivers/