Now if only this car I'm sitting behind in this traffic jam had a nice big white screen mounted in the back ...
As much as I generally don't love technology taking a paternalistic attitude toward restricting what happens on the infotainment system, I really don't think it's a good idea to offer a feature like that, unless it only functions when the car is stopped and not in gear.
Very common to walk past cars stopped at the lights and see tv showing everywhere. they dont turn it off when they start driving either ;-)