Andrew, check this article out
here are some snippets from it and I post the complete link to the article for your reference.
"We have seen again and again that there is no difference between hands-free and hand-held devices," Drews said. "The problem is the conversation," he added.
According to Drews, drivers talking on the phone are paying attention to the conversation -- not their driving. "Drivers are not perceiving the driving environment," he said. "We found 50 percent of the visual information wasn't processed at all -- this could be a red light. This increases the risk of getting into an accident dramatically," he said.
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In the study, 40 people followed a pace car along a prescribed course, using a driving simulator. Some people drove while talking on a cell phone, others navigated while drunk (meaning their blood-alcohol limit matched the legal limit of 0.08 percent), and others drove with no such distractions or impairments.
"We found an increased accident rate when people were conversing on the cell phone," Drews said. Drivers on cell phones were 5.36 times more likely to get in an accident than non-distracted drivers, the researchers found.
The phone users fared even worse than the inebriated, the Utah team found. There were three accidents among those talking on cell phones -- all of them involving a rear-ending of the pace car. In contrast, there were no accidents recorded among participants who were drunk, or the sober, cell-phone-free group.
The bottom line: Cell-phone use was linked to "a significant increase in the accident rate," Drews said.
He said there was a difference between the behaviors of drunk drivers and those who were talking on the phone. Drunk drivers tended to be aggressive, while those talking on the phone were more sluggish, Drews said.
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Tyson pointed out that talking on the phone is very different than talking to the person in the passenger seat. "If you are engaged in a conversation with a passenger, the passenger has some situational awareness, whereas a person on the phone has no idea what you are dealing with on the road," he said.
"Our recommendation is that you should not talk on the phone while driving, whether it's a hand-held or hand-free device," Tyson said. "We realize that a lot of people believe that they can multi-task, and in a lot of situations they probably can, but it's that moment when you need your full attention, and it's not there because you are busy talking, that you increase the likelihood that you are going to be involved in a crash," he said.
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