Take a comparison of the USA with Germany (where there are even roads that don't have a posted speed limit, which foreigners misunderstand for unlimited speed allowed). The USA's per capita automobile death rate is over twice as high as Germany's, in spite of speed limits in general being lower in Germany and there being far more and more generous roads in the USA. That's even with Germany being far more populated than the USA.
So you might say, well, Americans drive more. Statistically speaking though, you would think that more driving on wider, bigger roads and in less densely populated areas would lead to less accidents and not more. And then when you look at the statistics of automobile deaths per miles driven you get a 55% higher death rate in the USA than in Germany. There seems to be rather tenuous correlation between traffic danger and speed, at best.
The problem is horrible drivers, not speed. We should have a far more rigorous system of driving qualification and recertification. But who are we kidding, speed limits and enforcement have nothing whatsoever to do with safety.
Divest the conflict of interest between governmental coffers and speeding tickets and then you can maybe start having a case that the motivations are somehow related to safety. But that's a whole different issue called unfettered government corruption and graft.
http://en.wikipedia.org/wiki/List_of_countries_by_traffic-re...