Roads are paved with warnings against using a cell phone behind the wheel. One study compared the danger of driving while on the phone to drunk driving. The habit is illegal in many places, but a study from Australia suggests bans may be no more of a deterrent than warnings.
Two University of Utah psychologists in the United States concluded in a paper published in the Summer 2006 issue of Human Factors: The Journal of the Human Factors and Ergonomics Society that impairments associated with using a cell phone while driving can be as profound as those associated with driving while drunk. Earlier studies by the two professors, David Strayer and Frank Drews, made powerful arguments for not making or receiving calls on any type of device while driving.
As Professor Drews pointed out in an interview with The Ergonomics