text: At the beginning of this experimentation for the self driving car, lots of people trying to get it to work were using "smart" roads. Roads that had electrical cables or magnets in it, but the cost for "smart" roads would not be worth it. "Smart" cars though are cheaper than fixing and replacing all of the roads in the world. "Smart" cars had many sensors, video cameras, and a GPS receiver. They have a sensor on top of the car that is constantly making a three-dimentional model of the cars surrounding so the car can react to what is going on around it.