Google公司教會了他們的自動駕駛車，如何有禮貌地按喇叭。
Google公司做了測試，其自動駕駛車已能分辨假警報，和真實危險狀況，例如三點轉彎，和逆向行車的分別。
在測試階段初期，該車輛的喇叭，只有車內的人聽得到，測試駕駛員會記錄，該喇叭是否按得恰當。
Google宣稱該測試結果，有助於改進鳴按喇叭的演算法，進而將喇叭擴音到車外。
例如，若有別的汽車慢速倒車，朝Google無人車駛來，它會鳴兩聲短喇叭。
如遇緊急狀況，例如有行人不看路，或是有車快速駛來，它會鳴響又長又大的喇叭響聲。
通常行駛間靜音的無人車，在遇到視障者與其他路人時，也可模仿一般傳統車輛的聲音，使他們注意來車。
Google正在測試24輛Lexus牌RX450h休旅車，以及34輛汽車產品原型。每週大約行駛一萬到一萬五千英哩。
Google自動駕駛車至今為止，只出過一次歸咎於它的車禍。
該事件發生於今年情人節，一輛Google無人車在矽谷，撞上了一輛巴士。
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.
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