[elandrum]

Ah sorry, I was conflating two technologies (which are basically the same in my model). "Available LaneSense® Lane Departure Warning with Lane Keep Assist alerts you with visual and audible warnings during unintentional lane drifts and corrects your vehicle back into its lane."

I get a visual (and optional audio -- which I disabled) warning and a little steering wheel resistance to bring it back into the middle of the lane.

While I'm not sure what the minimum speed for adaptive cruise control is, but I use it in freeway stop & go traffic often.