Google admits that its experimental self-driving cars have had some close calls, but points out that in late 2014 incidents happened once every 1,300 kilometers, while last year they happened once every 8,500 kilometers.
谷歌承认其进行试验的自动驾驶汽车曾经险象环生, 但指出2014年末的事故是行驶1300公里才发生, 而去年则是8500公里后。