According to car manufacturers, hands-free driving has important benefit. For one, driverless cars can improve safety. In the United States, over 90% of car accidents are the result of human error. Drivers can make bad judgment, get sleepy, and run red lights, but robots don't. In a hands-free car, people can respond to email without worrying about hitting another car. Also,driverless cars would use less fuel. they don't need to be as heavy because they are less likely to crash