Need to get this guy off the road

That's not at all what this is. First, it's an opinion of how safe the road would be IF certain conditions existed. It's not a call to break the law, and to drive 20mph over the limit. It's an opinion that it would be plenty safe to change the speed limits, by raising some and lowering others, based on the performance ability of the cars that are driving in the roads today (Note: this doesn't mean the most modern cars, as this would also not be representative of reality.) Second, the opinion is based off of data. I don't remember the study, or I would cite it, but there was a study done a few years ago, I believe out of Stanford, that showed that while speeding was certainly a cause of accidents, it was actually far more dangerous to perform other actions like drunk, distracted, fatigued, and aggressive driving, tailgating, changing lanes without turn signals, changing lanes without looking, changing lanes frequently, changing multiple lanes at once, etc. Obviously speed contributes to a level of danger in the road, but regardless of that, we've moved from our first motor vehicle speed limit of 12mph in cities, and 15mph on country roads in 1901 to an average maximum speed limit of about 70mph and the US's highest speed limit of 85mph. There is absolutely no question whatsoever that driving 70mph is inherently more dangerous than driving 15mph, so why is it okay for us to drive 70mph today, even though it wasn't okay in 1901? To answer, in large part, it's because it is FAR less dangerous to drive 15mph today than it was in 1901. And it is far less dangerous to drive 70mph today than it was in 1995 when many states raised their speed limits from the previous country wide 65mph speed limit. As cars become safer with higher performance parts than previous generations had, it becomes less and less dangerous to drive at a given speed.