text: Google has also modified Toyota Prius to use position- estimating sensors, rotating sensors on the roof, video cameras mounted near rearview mirrors,there is alot of technology in this car but there is something way more important in this car. It is a spinning sensor on the roof, Dubbed LIDAR, it uses laser beams to form a constantly updating 3-D model of the cars surroundings and you could use that if the car was driverless. You could do this to see where to have the car go if it is auto.