Strange, because there are a LARGE number of driving fatalities caused by this exact behavior every year. The common explanations are: driver dozing or falling

Strange, because there are a LARGE number of driving fatalities caused by this exact behavior every year. The common explanations are: driver dozing or falling asleep, unexpected curve with poor visibility, driver mistaking the shoulder for another lane, and driver striking median to exit ramp by misjudging a lane change. Humans do all of these things, on a daily basis. So by human standards, accelerating and crashing into a barrier is quite commonplace.