I have to correct you on one point- You stated:
"No matter what speed limit you set, people will drive faster than what it is. Where the speed limit is 55, people drive 70. where the speed limit is 65, people drive 80. If the speed limit was 85, people would drive 95, and so on. No matter what it is, people, being what they are, will NOT adhere to the posted speed limit, no matter what it is. Does anyone really believe that if the limit were raised to 80, 90, or even 130, that people would suddenly stay at the posted limit as opposed to now? "
Actually, the bulk of research on the topic has shown that there is an appropriate speed for every road at which (absent some concealed hazards) around 85% of the drivers will go- they call it (remarkably enough) the "85th percentile speed," and it is regarded by traffic safety engineers as the ideal speed for a given road.
As a result, notwithstanding the oft-quoted slogan, "speed kills," it can be true that a lower speed limit, on a road more appropriate for a higher one, is more dangerous than an appropriate higher limit.
And, the research has also shown that, even where you have unlimited or very high limits, most drivers on a particular road will settle around the same speed - the 85th percentile speed.
Most people do not set ther speed by looking at the speed limit, deciding by how much they want to violate it, and going that speed. Research has shown, time and again, that the assertion that "if you raise the speed limit, everyone will just go x mph faster than the limit" is patently false.
As a result, it is reasonable to conclude that any speed limit which (again, absent concealed or unusual hazards) is set below the 85th percentile speed, is likely to create more speed variations; more hazards; and is mostly calculated to enhance the collection of speeding fines, not the promotion of traffic safety.
All of the above, ofcourse, is not intended to minimize the consequences of erratic or excessively dangerous driving- but this is what's done by those outside the "85th percentile," and it can be extremely high speed- and extremely low speed. Each is dangerous in its own way, and those who self-reighteously assert that their slow speed inevitably equates with safe driving, are every bit as much a threat to safe conduct on the roads as the "speed demons."
I'd love to discuss this more, and cite to some illuminating research and sources, but I have to go earn a living now so I can afford to fly somewhere and take lots of pictures of pretty airplanes. Bye.
...three miles from BRONS, clear for the ILS one five approach...