DRIVING BEHAVIORS REPORTED FOR DRIVERS AND MOTORCYCLE OPERATORS INVOLVED IN FATAL CRASHES, 2008
Behavior  Number    Percent  
Failure to keep in proper lane or running off road   12,106 24.1%
Driving too fast for conditions or in excess of posted limit or racing   10,812 21.5
Under the influence of alcohol, drugs, or medication   7,186 14.3
Inattentive (talking, eating, etc.)   4,711 9.4
Failure to yield right of way   3,493 7.0
Overcorrecting/oversteering   2,257 4.5
Failure to obey traffic signs, signals, or officer   2,059 4.1
Swerving or avoiding due to wind, slippery surface, other
vehicle, object, nonmotorist on roadway, etc. 
2,043 4.1
Vision obscured (rain,snow,glare,lights,building,trees,etc.) 1,369 2.7
Operating vehicle in erratic, reckless, careless or negligent manner 1,334 2.7
Making improper turn   1,296 2.6
Drowsy, asleep, fatigued, ill or blacked-out 1,210 2.4
Driving wrong way in one-way traffic or wrong side of road 747 1.5
Other factors   8,491 16.9
None reported   17,358 34.6
Unknown   829 1.7
Total drivers (1)   50,186 100.0%

(1) The sum of the numbers and percentages is greater than total drivers as more than one factor may be present for the same driver.

Source: U.S. Department of Transportation, National Highway Traffic Safety Administration.