text: The driverless cars will be ran by automotive radar sensors, GPS reciever, and an inertial motion sensor among ther devices. Those things could break at any given moment and the passenger(s) in the car won't know and will assume everyhting is fine, but seconds later they are in a crash just because the car devices are broken. When someone is in the diverless car they could fall asleep or just could not be paying enough attention. Even though the seat will viberate when the person needs to take over, they could be a heavy sleeper and they won't feel the vibration. The car requires that the driver needs to be alert and ready to take over if the road conditions are too much to handle for the car to drive its slef. What happens when the person isn't paying attention? A car accident could and will happen.