Actually, jamming the signal may increase the hazard, IMHO.
Imagine Joe Cellphone or Jill Cellphone is engaged in conversation while driving, and then that conversation suddenly is cut off by your jamming of the signal. Because they do not know why they lost their signal, they are likely to take their attention away from their driving tasks in order to try to connect again, and again, and again.
Ergo–your solution may actually result in even less attention to their driving tasks than if you had just gritted your teeth and ignored them.
I share your frustration and annoyance with cell phone scofflaws.
However, I don’t think that your solution is an elegant one, and because it does not talk to me, I also doubt that your solution is “eloquent”.