text: Driverless cars would use half the fuel of today's taxis and offer better transportation than a bus. These cars could possibly change the world and advance technology. These driverless cars are helpful but need a lot of sensors,a GPS receiver,and laser beams to form a constant update of the 3-D model of the car's surroundings. Sensors are needed for these unique cars because they advance the car to mimic the skill of humans at the wheel and respond to the danger or something out of control. These sensors give the car info or a warning to cause the car to apply brakes and reduce power from the engine. The sensors give the special car better responses and more control than a human driver could manage alone.