text: First of all, driverless cars are not safe enough and today, these so-called driverless cars can only control themselves under centain conditions, which means human drivers are still necessary. Just as BMW pointed out:" They can steer, accelerate, and brake themselves, but all are designed to notify the driver when the road ahead requires human skills, such as navigating through work zones and around accidents." This means human drivers still play an important role in driving and they should always be prepared so that they are able to take over immediately if necessary. It deserves consideration that whether what we want is just a driving-assisting system. If driverless car cannot control itself under all conditions safely, it is not worth devoting millions dollers and endless hours into its development.