from my personal experience on 495/95, i have seen nothing clear that would point to a large majority of the drivers with poor/reckless driving being from a particular state. this of course is measured in ratio. i have a total of 60mi a weekday commute on the beltway so i have racked up a lot of experience in this matter.
i will tell you this, i rue the forthcoming of minivans and SUVs.
"the wisdom of the wise will perish, the intelligence of the intelligent will vanish."