If it were up to me they should gather them all up and grind them up and seed the wadis in Terrorist Territory. Not just cars, People are hard to find without one glued to their ear. I've been run over in Wally World, in the suoermarket and on the sidewalk.
I once saw a man go into the Men's room, do his thing, and come out without ever putting the phone down.
I had a lady in the Ford Maintenance waiting room turn off the TV and then sit down and conduct her business for all of us to hear.
I remember when my boss gave me a pager, and then a car phone. On my days off I used to park my boat out in the middle of the lake so I wouldn't be disturbed.
OTOH they don't need new laws. They can fit into present statutes such as wreckless endangerment, disturbing the peace etc. There are too many damned laws. Give me a chance and I can reduce them back to the basic 10.