Google's self-driving car is designed to work without a gas pedal（踏板）or steering wheel（方向盘）. Now, the company has confirmed that the car doesn't have any windscreen wipers either, because there's no need for passengers to see where they are being driven.
The car requires no input from a driver, other than telling it the destination. There is no driving in the way we know it and all people inside the cars will be passengers who can spend their time paying no attention to the road. While the car may not need windscreen wipers, the lack of them may make passengers feel helpless if they are unable to see where they are going clearly.
Google's two-seater "bubble" cars have buttons to begin and end the drive, but no other controls. An on-board computer uses data from sensors, including radar（雷达）and cameras, to make turns and navigate its way around pedestrians and other vehicles. Under the vision made public by Google, passengers might set their destination by typing it into a map or using commands. The new car can't go faster than 25 miles per hour（40 km/h）. It is electric and has to be recharged after 80 miles（129 km）. They can only be used in areas that have been thoroughly mapped by Google.
Google has been testing its self-driving cars since 2009 and its steering wheel-less sample since early this summer. It intends on making its driverless cars available to consumers in the next five years. The ultimate goal of the project is computer-controlled cars that can get rid of human error, which results in about 90 percent of the 1. 2 million road deaths that occur worldwide each year and it was also inspiring to start with a blank sheet of paper.
