actually they had a concept car that drove itself awhile ago. Thing was back then it would require everyone to be on the same system but now a days I guess there is already like automatic braking and stuff so I guess that is actually feasible. As far as a device maybe something that will allow you to communicate with other cars. Like entering the license plate would be like dialing a phone number type of thing. That way you can be like hey nice car. And also since it would be like dialing then you can just mute people that are freaking out.