Although most major automakers are working on self-driving systems, Google also has been pushing ahead with the technology...Mr. Torcellini took his hands off the steering wheel, lifted his foot from the accelerator, and the Lexus hybrid drove itself, following the curves of the freeway, speeding up to get out of another car’s blind spot, moving over slightly to stay well clear of a truck in the next lane, slowing when a car cut in front.