信号灯故障导致了这次撞车事故。
目前官方尚未公布此次事故的调查结果，但媒体报道引用官方说法是信号灯故障是造成事故的关键因素。
Authorities have not yet disclosed the results of an investigation into the cause of that accident, though state media cited officials saying signaling equipment was thought to have been a key factor.
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.
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