The National Safety Council (NSC) estimates that 25% of all crashes are caused by cell phones. The National Highway Traffic Safety Administration (NHTSA) estimates that driver distraction from all sources (including cell phones) contributes to 19 percent of all crashes (2008). Even then, this is not necessarily the cause of the crash.

Both cannot be true, someone here is wrong. The NSC report is merely a statistical extrapolation of what might have happened, heavily based on averages. More real world data to corroborate their numbers is needed. The NHTSA has the opposite problem. Their numbers are based on real world reports. These suffer from reporting errors, often because those involved in a crash might not report being distracted while driving.