WASHINGTON – An estimated 17 million people have driven while drunk at least once on U.S. streets and highways in the course of a year, according to a government study released Wednesday.

A National Highway Traffic Safety Administration survey conducted in late 2008 found that 20 percent of those 16 and older reported driving within two hours of drinking alcohol.

Based on the survey results, NHTSA estimates that 8 percent of all drivers, or 17.2 million people, have driven at least once over the course of a year, even though they thought they were drunk.

Additionally, 8 percent said they got a ride from a driver they thought was drunk. This was a particular problem for males between 21 and 24 years old. In this age group, 24 percent reported riding with a driver they thought had consumed too much alcohol.

On the positive side, 81 percent see driving drunk as a serious public safety threat.