Snapping turtles live to be over 40 years old. They cannot retract into their shell because they are so big. As a result, they can reach anywhere when you try to pick them up. If you think that you are clear of the head, they can open a big gash on your hands with the claws on their feet.
Obviously by the size, this guy was pretty old. Its a shame that he had to die by being hit by a car.
I didn't mean for this picture to be shown as the dead turtle pushing up daisies, but that's just part of the irony of life.