accident instead sleep towards break
Why would people want a driverless car? One reason is convenience (便利). Drivers could relax or work of having to drive and watch traffic. Besides, robot cars could do better than human drivers in many ways. They don't get scared when a car is running them. They don't get distracted (分心的). They don't get angry when someone is traffic rules. They don't get tired after working for a long time. They don't fall . We could program cars to deal with every possible emergency，from a flat tire to bananas on the road. Car computers could also share information about traffic , so other cars can avoid them.
