Babies born after 2017 may never need to take a driving lesson because of the self--driving cars. Some scientists say that self--driving or driverless cars may hit the road within 15 years, and it is possible that driving may become unnecessary, or more relaxing and enjoyable.Companies like Google, Baidu, Apple and Alibaba are working on driverless cars. This kind of cars may change the way we live in the future. All you have to do is typing in your address! According to Baidu, the driverless technology has the following four advantages. Firstly, driverless cars are actually safer. In China, there are more than 500 deaths caused by accidents. With driverless cars, the number will decrease by 100 times. Secondly, driverless cars are more efficient than manned cars. Thirdly, driverless cars follow the traffic rules. Therefore, traffic controlling will be easier. At last, the cost of transportation will be reduced as the labor cost becomes less. There are many different technologies needed to make a successful self--driving car. The most difficult technologies of all are environmental perception (感知), behavior prediction, planning control and exact GPS. According to some scientists, driverless cars may make driving become enjoyable. Passengers don‘t need to tell the driverless cars where they want to go. Driverless cars are safer than man--controlled cars. The underlined word "decrease" in the third paragraph means "减少". We can learn from the passage that the technologies for driverless cars have already well developed.