据Google透露，在行车测试中，仅发生了一个小事故，当时其中一辆试验汽车在交通信号灯前停下时，后面车辆与之发生了追尾碰撞。
According to Google, only one minor accident took place during the testing, when one of the cars received a bump from behind at traffic lights.
他无视交通信号，从而引起了交通事故。
目前我国煤矿井下通讯基本上是有线装置，依靠电缆传输信息，一旦发生事故，通信马上中断。
At present, we use wire communication underground coal mine in our country. Information is transmitted by electric cable. When the accident happened, the communication is discontinued at once.
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