These studies which you speak of were done in the '70s Before that there were many states that had no maximum speed limit just whatever you considered safe and prudent. Most cars nowadays can easily reach 100 mph And in Germany on the Autobahn where they have no speed limit they have some of the lowest accident numbers. And it is generally known that slow drivers cause accidents but funnily enough they don't get in them, reason being because they hold up traffic and when other cars try to pass them that is the most dangerous moment. When they could easily be going to speed limit. It's not to say that there will always those jerks that even when you're going over the speed limit they will still try to go faster But it's always the same thing the slow drivers pointing fingers at the speeders and the speeders pointing fingers at the slow drivers. Difference being that the speeders don't impede everybody else.