There should be no difference with automobiles than with airplanes. A computer should know where every automobile(within its given area) is and its speed and direction of travel and last its destination. All this information would be erased once the automobile either reaches its destination or is out of its given area of concern for privacy concerns. Cell towers would be a great help here. All cell towers would have a computer to control the traffic around it. Any automobile would communicate with the tower any problems it is having. This information would be than communicated with all vehicles close to it. The speed of each vehicle would not be up to the driver but would be determined by the computer. There are occasion where there is a sudden loss of visibility. The computer would be able to slow all the vehicles to a safe speed at the same time. The question is how much are we going to sacrifice to save over 30,000 lives every year? Of course if we knew that it would be our own life that was saved, we would demand that the other drivers sacrifice a lot. But since we do not know whose lives will be saved a lot of us are not willing to sacrifice much.