text: When the driverless car is in motion, it has many sensors to make sure that the car can drive safely to its destination. The car may also not be able to see a deer jumping out, or a kid running across the road quickly. The sensors woudn't be able to know when a car is quickly whipping around a corner where the computer can not see. The car would be unaware of any unexpected interactions and thats not safe for us to have on our roads.