what (one) is driving at
The point one is trying to make. He's been talking for 10 minutes, and I still can't figure out what he is driving at. Is there a point? What I'm driving at, ladies and gentleman, is that the time for action is now.
what someone is driving at
the point that someone is attempting to make. 1986 Robert Sproat Stunning the Punters Martin is always saying things where I can't see what he's driving at.
what somebody is ˈdriving at
the thing somebody is trying to say: What are you driving at? Try to explain what you mean more clearly.I wish I knew what they were really driving at.