I guess if you could also make it to where you could call 1 emergency contact on your contact list + local police (non emergency numbers).
Just from personal experience, I encountered a very reckless motorist a few weeks ago (I was driving as well) that was running red lights and changing lanes erratically. I was able to telephone the police, follow them at a safe distance, and relay their direction of travel and vehicle description so that the local police could stop them.

In instances like that, crazy drivers get away with crimes.

I'm all for stopping distracted driving, but I think it would be better to tackle the problem with high fines and strict enforcement versus putting people at risk by taking away cell phones.