See, the system allows you to choose the speed at which your car is travelling when it decides to text you. So if your crazy teen decides to race the friend in the next lane, or just loses concentration because of excessive head-banging and general high jinks in the drivers' seat, you'll get a text. Again, not quite sure what you're supposed to do at this point since the last thing you'll want is to distract errant teen further by texting back or phoning. Perhaps they should put one of those disablers in the car too, so that you can just flash them a quick warning that the engine is being cut and advise them to pull over to the hard shoulder to cool off?
What say you?
PS - Here's a few links to help keep your teen driver safe.