英文原文：
Google has taught its self-driving car how to honk in the most polite way.
Google tested its self-driving car on distinguishing the difference between false alarms, such as a person making a three-point turn, and dangerous situations like someone driving down the wrong side of the road.
During the initial test phase, the honks were heard only inside the car. The test driver would note whether the honk was made appropriately.
Google announced that the test results helped to improve its honking algorithms, promoting them to broadcast the honks to people outside the vehicle.
For example, the Google vehicle would make two short beeps to alert another car that is slowly reversing towards it to its presence.
It would make a long and loud beep in urgent situations such as a distracted pedestrian or an oncoming vehicle.
The otherwise silent vehicle can also mimic the sound characteristics of traditional cars to help alert pedestrians and the visually impaired to the car’s presence.
Google is testing 24 Lexus RX450h SUVs and 34 prototype cars, which are driving an average of 10,000 to 15,000 miles per week.
Google self-driving cars have been involved in only one crash that was their fault.
That happened on Valentine’s Day this year, when a Google car hit a bus in Silicon Valley.
原文影片請看此
http://bit.ly/1svJmLh
