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Background. Most past studies of crash data estimate roughly 1% - 4% of crashes involve a drowsy driver BUT Many researchers believe that official statistics underestimate the prevalence of drowsy driving AND A few studies using different data and methods have suggested that the prevalence of drowsy driving may be much higher .
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1. Asleep at the Wheel:The Prevalence and Impact of Drowsy Driving
2. Background Most past studies of crash data estimate roughly 1% - 4% of crashes involve a drowsy driverBUT
Many researchers believe that official statistics underestimate the prevalence of drowsy drivingAND
A few studies using different data and methods have suggested that the prevalence of drowsy driving may be much higher
3. The Study
4. Part I: Prevalence of Drowsy Driving among Drivers
5. Method Data collected as part of the AAA Foundations 2010 Traffic Safety Culture Index
Nationally-representative telephone survey of 2,000 U.S. residents 16 and older, conducted May 11 June 7, 2010
Asked respondents about experiences with falling asleep at the wheel and general drowsy driving
6. Key Findings
7. Additional Findings
8. Part II: Proportion of Crashes Involving a Drowsy Driver
9. Method Analyzed data from nationally-representative sample of crashes in which a car, light truck, van, or SUV was towed
Years 1999 2008
Sample included 80,821 vehicles involved in 47,597 crashes
Drowsiness = unknown in 45% of cases ? used statistical technique of multiple imputation to estimate proportionthat were drowsy
10. % of Crashes that Involved a Drowsy Driver
11. Additional Findings Drivers 16-24 years old nearly twice as likely to be involved in a drowsy driving crash as drivers ages 40+
Two out of three drivers involved in a drowsy driving crash were men
Drivers travelling alone nearly 2x as likely to be in drowsy driving crash compared to drivers with passengers
57% of drowsy driving crashes were single vehicle crashes where driver drifted out of lane or off road
12. Tips for Avoiding Drowsy Driving Get at least 6 hours of sleep the night before a long trip (preferably 8; no less than 6)
Travel at times you are normally awake; stay overnight en route instead of trying to drive straight through
Schedule a break every 2 hours or 100 miles
Dont work all day and drive all night
Travel with a passenger who is awake
Drink a caffeinated beverage, but remember that it takes 30 minutes for effects to kick in