SALT LAKE CITY -- Drivers are far more distracted by talking on a cellular phone than by conversing with a passenger in an automobile, according to a new study by University of Utah psychologists Frank Drews, David Strayer and Monisha Pasupathi.
The study, which used a sophisticated driving simulator, found that when drivers talk on a cell phone, they drift out of their lanes and missed exits more frequently than drivers conversing with a passenger.
The findings are being released Monday, Dec. 1 by the American Psychological Association and published in the Dec. 15, 2008, issue of the Journal of Experimental Psychology: Applied.
"The passenger adds a second set of eyes, and helps the driver navigate and reminds them where to go," says Strayer, a professor of psychology at the University of Utah and a co-author of the study.
Previous studies by Strayer and Drews have found that hands-free cell phones are just as distracting as handheld models because the conversation is the biggest distraction. They also have shown that when young adults talk on cell phones while driving, their reaction times become as slow as reaction times for senior citizens, and that drivers talking on cell phones are as impaired as drivers with the 0.08 percent blood alcohol level that defines drunken driving in most states.
Strayer says he often is asked about the distraction caused by conversations with passengers versus people on the other end of a cell phone, "because in both cases you have a conversation."
But "when you take a look at the data, it turns out that a driver conversing with a passenger is not as impaired a driver talking on a cell phone," he says. "You see bigger lane deviations for someone talking on a cell phone compared with a driver talking to a passenger. You also find when there is a passenger in the car, almost everyone takes the exit. But half the people talking on the cell phone fail to take t
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University of Utah