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Driving While on Cell Phone Worse Than Driving While Drunk
06.29.06, 12:00 AM ET

THURSDAY, June 29 (HealthDay News) -- Maneuvering through traffic while talking on the phone increases the likelihood of an accident five-fold and is actually more dangerous than driving drunk, U.S. researchers report.

That finding held true whether the driver was holding a cell phone or using a hands-free device, the researchers noted.

"As a society, we have agreed on not tolerating the risk associated with drunk driving," said researcher Frank Drews, an assistant professor of psychology at the University of Utah. "This study shows us that somebody who is conversing on a cell phone is exposing him or herself and others to a similar risk -- cell phones actually are a higher risk," he said.

His team's report appears in the summer issue of the journal Human Factors.

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.

In addition, the researchers found talking on the cell phone reduce reaction time by 9 percent in terms of braking and 19 percent in terms of picking up speed after braking. "This is significant, because it has an impact on traffic as a system," Drews said. "If we have drivers who are taking a lot of time in accelerating once having slowed down, the overall flow of traffic is dramatically reduced," he said.

In response to safety concerns, some states have outlawed the use of hand-held cell phones while driving. But that type of legislation may not be effective, because the Utah researchers found no difference in driver performance whether the driver was holding the phone or talking on a hands-free model.

"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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