Driverless cars are vehicles that are self-driving and able to navigate (行驶于） the environment without requiring a human. They are also referred to as robotic cars and self-driving cars. Here are some
facts about driverless cars.                                                                                 
 * They are able to recreate roadways in three dimensions.                     
* They must recogize pedestrians（行人），road signs, other vehicles, and traffic lanes in order to function.                                                                    
*A driverless car would be capable of functioning without human intervention (干预） of any kind.         
* The first driverless car model was operated by Google under Alphabet Inc. in 2015.
* It has been estimated that by 2050 almost all vehicles on the road willl be driverless.
* Human error accounts for roughly 90% of accidents on roadways. The creation of driverless cars was in an effort to reduce accidents.             
 * One of the major issues for driverless cars is the weather. When the weather is bad, it results in a huge amount of data that must be processed and it can affect the process. 
* Diiverless cars could help eliminate the issue of drunk driving.
1.What are diiverless cars also called?  Robotic cars and _____________ .
2.What should a driverless car do in order to function on a road?       It must recognize_____________ , other vehicles, and traffic lanes.
3.When was the first driverless car model operated?  In _____________.
4.What has been estimated about vehicles on the road by the year 2050?Almost all of them will _____________.
5.What is mentioned about the issue of drunk driving? Driverless cars could help  _____________