Christopher urmson , a carnegie mellon university robotics scientist , was behind the wheel but not using it .
卡内基梅隆大学的机械学家克里斯多佛厄姆森坐在方向盘后面，但并没有在驾驶。
When he returned to automated " cruise " mode , the car gave a little " whir " meant to evoke going into warp drive on " star trek , " and dr. urmson was able to rest his hands by his sides or gesticulate when talking to a passenger in the back seat .
