@aldertree00644 Where I am confused is that there is an assumption with the application of that rule because we're saying: Roadways are safer if the average speed is adopted as the speed limit for that road. But when I apply the rule (E) to roads in Nebraska maybe I measure the average speed at 70 mph making the 75 mph speed limit too fast. But then I go to Kansas and I measure the average speed at 80 mph. I know the question explicitly says that the national average is 75 mph but does that discount the microcosms of higher/lower average speeds on all roads of the same type?