text: The biggest thing that's stopping driverless cars from being on the streets in my opinion is safety. Nobody has saw driverless cars on the street, so we don't know how to react to something so new. Driverless cars would have all of these sensors that will keep the car from crashing or breaking speed limits. These driveless cars are only mimicing a human at the wheel, but these signals and sensors are way safer then a humans senses and signals.