that 20 percent of all accidents have sleepiness as a contributing factor [source: TheDenverChannel]. If a driver is tired enough to actually fall asleep while driving, the results are predictable. Even on a relatively straight highway, a sleeping driver will eventually drift off the road. Trees, utility poles, ravines and bridge abutments turn this into a deadly scenario -- and that doesn't even take other cars into account.
You might think a few yawns are nothing to worry about, but just being a little drowsy is enough to increase your risk of getting in an accident. Responses can range from dozing off for a few seconds at a time to simply "zoning out" and losing all focus on the road. At highway speeds, one or two seconds of inattention can lead to disaster.
The solution is simple: Get a better night's sleep! Make sure you get a solid eight hours of sleep, not just on the night before a long drive, but on a regular basis. Failure to get enough sleep every night builds a sleep deficit that can leave you drowsy and unable to focus. If you're driving and feel the least bit groggy, take action immediately. Don't think you'll get any kind of warning before you fall asleep, or that you can fight it off. People can move from drowsy to sound asleep without warning. If this happens to you, have a friend take over behind the wheel, find a rest area where you can catch a few hours of sleep or take a break until you're feeling more alert.
Seat belts save lives. Worn properly, they prevent you from being thrown around the inside of a crashing vehicle or, worse, thrown through the windshield and flung completely out of the vehicle. NHTSA statistics reveal that more than half of all accident fatalities were people who weren't using seat belts [source: NHTSA]. The numbers are much scarier for young drivers and passengers: A staggering 70 percent of fatal crash victims between the ages of 13 and 15 weren't wearing seat belts.
Everyone has heard horror stories about people who were killed in bizarre freak accidents in which they'd have lived if only they hadn't been wearing a seat belt. Even if these stories are true -- many of them are exaggerations or urban legends -- they're also anomalies. In the overwhelming majority of car crashes, you have a greater chance of surviving if you're wearing a seat belt.
Even a low-speed crash can send an unbelted person careening into the dashboard or side window, resulting in severe head injuries or broken bones. At higher speeds, the possible fates of the unbelted occupant are gruesome: severe lacerations from being propelled through the windshield; struck by other cars because you landed on the road; slammed into a tree or a house at 50 mph (80 kph). Sound scary? Then buckle up.