The Terminatrix's ability was "forming complex machines," not necessarily just controlling machines. In order to drive a car remotely, all she'd need to do is send some of her nanobots into the car where they could form the machinery required to move the steering wheel, manipulate the throttle, etc. I'm still not convinced that she'd make machinery to pull the gas pedal down rather than just adjusting the throttle from the engine compartment -- not to mention that she could never have enough leverage from within the steering column to pull the transmission lever down -- but at this point I'm just nitpicking. I know better than most that "nobody likes a nitpick," so I'm declaring that my complaint with the movie is completely invalid, and apologize profusely to the film's creators for my mistake.
That said, in her comment explaining this, aerospace brought to my attention another complaint I once had, about which I had completely forgotten. In the "Terminator" universe, the abilities of the Terminators get better and better as technology in the future progresses. But they inexplicably send the new upgraded Terminators back in time to a point AFTER the failed previous attempts. The logical thing to do would be to keep going after Sarah Connor EARLIER in time, would it not? Why keep trying forward in the time line when you know she's going to be expecting it?
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