text: Driverless cars could be much safer than a car driven by a human. These cars would have many sensors. Google's modified Toyota Prius has a rotating sensor on the roof. While the human brain is amazing, it cannot process what is happening at all angles around the car. A hightened awareness of the car's surroundings could result in less wrecks. However, a human driver would still have to be in the front seat in case of an emergency.