Fine and dandy if all dad is interested in is administering punishment. But instilling discipline is a better idea, to my mind, and harder than heck to do from behind the wheel of the car.
I think that driving very slowly, following a walking person, is a danger to everyone around, especially if the driver is using a cell phone as this one was.
It would have been much better if he had bundled up and walked along with her at a vigorous pace.