More than 4% of drivers admit to falling asleep at the wheel within the last month
http://www.latimes.com/health/boostershots/la-heb-drowsy-drivers-20130103,0,7459771.story
People don't like to acknowledge it but the truth is that drivers are usually the weakest link in the automotive transportation system. Engineers are working hard to mitigate the risks caused by bad or inappropriate behavior behind the wheel such as systems to detect when the driver is getting drowsy or the car is drifting out of the lane.
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