For thousands of years, people used animals such as horses to get from one place to another. Then, at the (开始) of the 20th century, the invention of cars (改变) the way we moved around forever. It took （仅仅）a few years for people to make the move from animals to cars, so the move from petrol（汽油）cars to driverless electric cars will be even （更快的）.
Traffic has created huge (自然环境的)problems, so cities and towns around the world are looking for the way to solve the problems．Scientists have i driverless cars that run on electricity instead of petrol. Computer scientists have developed software for transportation. If we put these inventions together, we could f free our cities from traffic.
If there was more p in transport technology, we wouldn't need to own cars a. Instead，we'd call a driverless car when necessary. It would take us w we wanted to go and we'd get another one to go home. Driverless electric cars can work 24 hours a day, so we also wouldn't need so many car parks.
