text: Sensors in the cars could sometime be damaged or every ruined by rain or if the batter dies out on someone in the car. How would you be able to apply breaks on the car if you don't know if the car if front of you is gonna stop, will there be another sensor so you can see the car in front so the car knows. The car will basically be a computer working for you and then what if you're not sure if you could every be able to drive agin, you won't feel the need to because of these drivelss cars.