After controlling for driving difficulty and time on task, the study concluded that cell phone drivers exhibited greater impairment than intoxicated drivers
and this meta analysis:
Meta-analysis by The Canadian Automobile Association[10] and The University of Illinois[11] found that response time while using both hands-free and hand-held phones was approximately 0.5 standard deviations higher than normal driving (i.e., an average driver, while talking on a cell phone, has response times of a driver in roughly the 40th percentile).
and about my point with the conversation being a distractor:
In contrast, the University of Illinois meta-analysis concluded that passenger conversations were just as costly to driving performance as cell phone ones.[11] AAA ranks passengers as the third most reported cause of distraction-related accidents at 11 percent, compared to 1.5 percent for cellular telephones.[13] A simulation study funded by the American Transportation Research Board concluded that driving events that require urgent responses may be influenced by in-vehicle conversations, and that there is little practical evidence that passengers adjusted their conversations to changes in the traffic. It concluded that drivers' training should address the hazards of both mobile phone and passenger conversations
Just for shits and giggles lynx, go read this:
[ame]http://en.wikipedia.org/wiki/Mobile_phones_and_driving_safety[/ame]
especially the table at this point in the article:
http://en.wikipedia.org/wiki/Mobile_phones_and_driving_safety#Simulation_studies_versus_alcohol
and this conclusion:
and this meta analysis:
and about my point with the conversation being a distractor: