Most people can't talk on a cellphone and drive safely, study finds | Booster Shots | Los Angeles Times

Only a talented few can simultaneously talk on a cellphone and drive safely, according to a study from researchers at the University of Utah. The danger of a study like this is, of course, that everyone will think they are in the 2.5% of all people whom the study found to be "supertaskers." The pertinent fact is that 97.5% of us can't drive safely while talking on the phone -- even a hands-free phone.

The researchers assessed the performance of 200 people using simulated freeway driving while conducting a conversation on a hands-free phone that involved memorizing words and solving some math problems. Performance was measured in braking, reaction time, following distance, memory and math execution.

For the vast majority of people, performance suffered in both driving and comprehension. Braking time increased by 20% while following distances increased by 30%. Memory performance declined 11% and math performance 3%. The deterioration in performance was comparable to the impairment seen in drunk drivers, the authors said.

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