I heard somewhere that the largest cause of car accidents in Mexico(?) was the use of mobile phones. The best bit, most were using blocks of wood pretending that they were mobile phones!
Use of phones (for texting or calls) while driving is so predominant over here (NZ) - I see it many times per day. One guy swerved out from a car park into busy traffic while using the phone.
Of course, not so easy to catch and prosecute as speeding so you rarely if ever hear of someone being done for it.
Wow! The part about the school bus driver getting caught using his cell phone while driving really hits home (my 8-year-old rides the bus to school every day). Not to say that it's okay for any other type of bus driver!!