November 8th, 2010
12:01 AM ET

Drowsy drivers threaten road safety

Two out of every five drivers say they've fallen asleep behind the wheel at some point, and more than a quarter of drivers responding to a survery admit being so sleepy that they've had trouble keeping their eyes open while driving in the previous month, according to a new study by the AAA Foundation for Traffic Safety.

Researchers also found that one in 10 people reported falling asleep while driving within the past year.  The study was based in part on telephone surveys of 2,000 U.S. residents ages 16 and older last spring .

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