Using a phone wile driving is one of my pet peeves, but this doesn't seem like an effective approach. If a problem person is already distracted (not a false-pos

Using a phone wile driving is one of my pet peeves, but this doesn't seem like an effective approach. If a problem person is already distracted (not a false-positive), will they even pay attention to the flashing sign? Just last night I had to knock on the hood of a woman using her phone while driving in the parking lot after she nearly ran over my wife and daughter walking to a restaurant. She was completely oblivious to the goings on around her and got extremely offended when I made the "hang up" gesture and told her to put down her phone while driving. ¯\_(ツ)_/¯