text: Driverless cars will be more efficient than humans because of their faster response to driving situations. This is possile by sensors that "can cause the car to apply brakes on individual wheels and reduce power from the engine." Many sensors will have to be placed on the car to provide the safest driving possible. Google has put many sensors on their modified version of a Prius, such as on the wheel, roof, rearview mirror, and even a 3-D camera ontop of the roof. All of these sensors help to mimic the actual driving skills of a human, but better.