In Ohio, the roads are rated at about 50% assuming a good driver with a proper vehicle. Take turns for example. Turns that are marked down to 35 mph are fine up to about 70 as long as there aren't other idiots in the way. On the other paw, I rarely go over 95 on the straights any more as my reflexes aren't what they used to be. Getting old sucks. They say it beats the alternative, but they won't say who told them.